Questions tagged [postfix]
Free and open source mail transfer agent (MTA) that routes and delivers email. When asking about postfix problem, please include the relevant maillog lines and output of the following command: `postconf -n` (non-default content of main.cf) and `postconf -M` (content of master.cf)
1,359
questions with no upvoted or accepted answers
15
votes
1
answer
7k
views
Change Envelope From to match From header in Postfix
I am using Postfix as a gateway for my domain and need it to change or rewrite the Envelope From address to match the From header. For example, the From: header is "[email protected]" and the Envelope ...
- 285
6
votes
0
answers
547
views
Postfix: do not create bounce message for virtual_alias_maps with remote servers
I am using virtual_alias_maps to forward mail to remote mail servers (GMail, icloud).
I have spam prevention in place myself (SPF checks, Before-Queue Content Filter etc), but often enough spam will ...
- 803
6
votes
2
answers
3k
views
How to log the whole SMTP session including DATA with postfix?
I am running a Debian 8.5 with postifx 2.11.3-1 and i try to log the whole smtp session including DATA to mail.log.
it was possible to see a part of the data by increasing the verbosity by adding -...
- 1,555
5
votes
2
answers
743
views
PAM vs /etc/shadow in Dovecot SASL configuration - Security differences?
I set up a server with Postfix SMTP auth through Dovecot SASL. However, it was not possible to get the PAM authentification working as standard out of the box.
So more by chance, I changed it to ...
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4
votes
0
answers
1k
views
Ways to integrate incoming and outgoing mail webhook in Postfix
I am trying to build an application in PHP which will be able to create a Ticket whenever a new mail arrives on a specific account and whenever a reply is done for that email, the application will ...
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4
votes
0
answers
2k
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Disable bounce in Postfix after failed mail forwarding
I have some mailboxes in Plesk/Postfix that redirect to some external addresses. If Postfix fails to forward a message to these addresses, it bounces back to the original sender, who is a fake address ...
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4
votes
0
answers
1k
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Postfix failed SPF check
I'm using postfix to send mail from my own domain and postfix-policyd-spf-perl to check SPF.
SPF check fail only when I send an email from my own domain to my own domain.
In summary :
mydomain -> ...
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4
votes
1
answer
3k
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When does Postfix not perform lookups in virtual_alias_maps?
I'm having a real pickle of a problem:
I have a Postfix 2.6.6 / CentOS 6 server that's set up to forward mail from specific aliases to specific destinations. This is done through a mysql ...
- 722
3
votes
0
answers
577
views
postfix smtpd process bound to unix domain socket
To utilize a special cleanup daemon for outgoing emails only, I defined a special smtpd process in master.cf that is used as default_transport. (Only postfix should be able to submit emails through ...
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3
votes
1
answer
374
views
TLSA lookup error for dhmx02.web.de:25
we are running a mail server and always the same error in the logs (for a specific recipient):
Aug 23 05:39:17 Mailer postfix/smtp[13561]: warning: DANE
TLSA lookup problem: Host or domain name ...
- 6,469
3
votes
1
answer
241
views
What is current advice on forwarding email - particularly to gmail
I want to move from my current hosting site to a VPS. I am very comfortable with the website hosting side of things but at the moment my stumbling block is email, something which I have never had to ...
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3
votes
1
answer
478
views
Remove unnecessary quotes from sender display name with special characters
I have set up Postfix with Dovecot and SquirrelMail on an Ubunutu 18.04 machine. Everything is working great, except for the display name with special characters.
In SquirrelMail, I have configured ...
- 131
3
votes
0
answers
11k
views
Sender address rejected: Access denied (in reply to RCPT TO command))
My email server has been ok for months now, since today my server would not receive any emails, I could send though. I seem to have fixed that by disabling and enabling UFW, not sure why that works ...
- 31
3
votes
0
answers
733
views
Postfix: Enforce sender address for some users only
I am looking for an option to enforce an envelope sender address in postfix for selected users, only. E.g., I want to permit [email protected] to send mails as [email protected], only, while all other ...
- 81
3
votes
1
answer
791
views
Hosting multiple websites (Apache Virtual Hosts), Postfix settings for sending mail FROM those domains?
I am not sure that this was the right solution in the first place but I have Postfix up and running on my Ubuntu VPS with G-Suite using
relayhost = [smtp.gmail.com]:587
Mail is delivering fine, ...
- 31
3
votes
0
answers
554
views
Stop postfix from sending non-delivery notifications when forwarded mail bounces
Some of my mail users are forwarding their mails to gmail for example. In some cases my Amavis lets some spam messages slip through. These mails are then bounced by gmail as they are spam. My postfix ...
- 139
3
votes
0
answers
1k
views
Don't send outgoing mail via Spamassassin
My e-mail server is running Postfix 2.11.3 on Debian 8.7 (Jessie) with Spamassassin 3.4.0.
I realized that my outgoing e-mails are also being checked for spam, which not only seems to be unnecessary ...
- 1,541
3
votes
0
answers
379
views
Postfix: Avoiding backscatter when acting as backup MX with unknown valid recipiants
I'm running Postfix 3.1.0, acting as backup MX (i.e. I have relay_domains set) for a domain whose valid recipients I cannot practically know. Thus, I would normally be producing backscatter when I ...
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3
votes
0
answers
5k
views
Change FROM Name with Postfix
Using Postfix on Ubuntu 16 with google smtp server.
Everything works fine. The only problem is that I can't seem to find out how to change the FROM name in postfix. I have rewritten the email ...
- 509
3
votes
0
answers
444
views
Prevent misdirected bouncebacks from forwarding server
Note: This question is a duplicate of Avoid creating backscatter on a Postfix forwarding server, for which the only answer was "sorry, nothing you can do", but I provide more detail here, consider ...
- 131
3
votes
0
answers
4k
views
SSL_accept error with postfix oportunistic STARTTLS
I have configured postfix 2.6.6 on centos 6 as a mailrealy in front of an exchange 2010 server. Things work. Now
I would like to add oportunistic encryption to incomming and outgoing mail.
At least ...
- 1,215
3
votes
0
answers
206
views
Postfix STARTTLS works in LAN but not externally
if I connect in LAN on port 25 to my mail server, it offers STARTTLS
telnet mailserver.com 25
Trying 192.168.0.x...
Connected to mailserver.com
Escape character is '^]'.
220 mailserver.com ESMTP ...
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3
votes
0
answers
1k
views
Configure mailgun as relayhost on top of existing postfix server already using sasl
I might be barking at the wrong tree completely here, but I'll ask anyway.
I've followed a tutorial to setup a Mailserver on ubuntu 14.04 with postfix, dovecot and mysql.
Now I have setup mailgun to ...
- 131
3
votes
0
answers
580
views
I need help trying to authenticate with AD from my linux machine
I am not experienced in this, so there might be some points that I am missing. Initially I tried to setup Cyrus Mail w/ SASL for AD authentication. After several tries, it failed to work.
I switched ...
- 1,187
3
votes
0
answers
295
views
Postfix relaying for multiple domains with Amazon SES
I'm a little confused about relaying with Postfix.
I added this line to my /etc/postfix/transport
mydomain34.com smtp:email-smtp.us-west-2.amazonaws.com
I know this is wrong, but this is what I ...
- 131
3
votes
0
answers
984
views
Unable to send email via Postfix SMTP via Mac Mail App
I installed a SMTP server with Postfix as mail agent (on Ubuntu 12.04). Config is as follow:
$ postconf -n
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_dot_mydomain = no
...
- 1,041
3
votes
1
answer
26k
views
Postfix / smtpd_relay_restrictions. How to allow relay from third party smtp server to any domains (but not open relay!)
By default, my Postfix allows relay emails sent to my domain (domain1.com) or only for password auth clients or for 'myhostname' addresses. This is a regular situation for most mail servers.
If I set ...
- 71
3
votes
1
answer
4k
views
Make Postfix search LDAP group members by UID instead of DN?
I'm creating an e-mail server with postfix (v2.7.1 on Debian 6.0) where users and groups are stored in an LDAP server.
Users accounts works fine but I want to create e-mail aliases from group (any e-...
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2
votes
0
answers
71
views
postfix wrappermode depending on destination
My ISP accepts mail on port 465 thus requiring smtp_tls_wrappermode = yes. However, I also have another internal server, to which I forward mail on port 25 using STARTTLS, but with ...
- 305
2
votes
1
answer
606
views
Postfix: How to log to syslog only?
I have Postfix 3.8.1 on Ubuntu 23.10. How do I configure Postfix to log to syslog only? My syslog daemon is journald.
According to my understand, Postfix should log to syslog, if maillog_file is not ...
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2
votes
0
answers
89
views
Docker Postfix Admin bulk aliases, custom maps, and custom config files
I'm in the process migrating my bare metal postfix implementation over to docker to essentially upgrade my old box to a more docker/vm-centric server and hopefully add virtual domain support. I'm ...
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2
votes
0
answers
312
views
need help to configure postfix / dovecot + SSL for ports 993, 465 + virtual mail/accounts from file + CRAM-MD5 authentification
I have some issues in my configs to have an full functional mailserver with CRAM-MD5 authentification for only port 993 and 465. Plz help me and others to get an right config file struct for ubuntu ...
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2
votes
0
answers
126
views
Dovecot trying to authenticate external users
I am using dovecot version 2.3.4.1 with SQL authentication and it works perfectly fine.
I see in the logs though that when I use a PHP script to email a list of users, that dovecot is trying to ...
- 133
2
votes
0
answers
108
views
suspicious postfix warnings
I am running a private mailserver for quite some time now, which is a postfix / dovecot setup. I noticed some log messages from postfix, which alerted me a little bit, and I hope, someone can explain ...
- 2,504
2
votes
1
answer
216
views
"Non-Open-Mail Relay" Postfix / Dovecot are relaying anyway; Mis-configured or CRACKED? Plus, presently blocked external users need access too
CRITICAL UPDATE
While working on this, there'd been no spam relayed for over a single day so I left it up and overnight, TWO emails got relayed! ACK!
Here they are, from my tail / grep commands (...
- 1,298
2
votes
1
answer
536
views
Scaling Postfix/Dovecot-Server
I looked at a larger installation of my local university of a Mailserver with Postfix/Dovecot. I am trying to archieve the same and looking forward to get any input or search query about how this ...
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2
votes
0
answers
385
views
OpenDKIM on MTA not signing mails from remote mail servers
I have a configuration where we have one MTA responsible for sending emails from a number of internal servers.
The internal servers all run Postfix on a number of different domains. They are all ...
- 277
2
votes
0
answers
202
views
Postfix inline regexp lookup table
According to the manual regexp_table(5) section INLINE SPECIFICATION there is a possibility to write the regexp lookup table inline.
INLINE SPECIFICATION
The contents of a table may be specified in ...
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2
votes
0
answers
302
views
Postfix SASL error: warning: unknown[xxx.xxx.xxx.xxx]: SASL LOGIN authentication failed: authentication failure
My use case is to use my own mail server to send emails from CCTV NVRs to overcome the daily limits imposed by GMail. The NVR has an option to setup authentication. The config worked for whitelisted ...
2
votes
0
answers
1k
views
Is it possible to use MTA-STS in Postfix without overriding DANE?
The SMTP MTA Strict Transport Security RFC 8461, 2 clearly states that:
However, MTA-STS is designed not to interfere with DANE deployments
when the two overlap; in particular, senders who implement ...
- 50.2k
2
votes
1
answer
959
views
How do I tell Dovecot to use another server for SMTP?
I am a bit lost on mail servers, but I have to install a mail proxy (Proxmox Mail Gateway) in front of the actual mail server (ISPConfig, Roundcube, Dovecot, Postfix).
On receiving emails, it uses the ...
- 21
2
votes
0
answers
569
views
Postfix email not send from subdomain
I have setup email server on ubuntu with Postfix, roundcube, powermta.
mail server domain: mail.example.com
emails are working fine when I test with gmail.
I have installed mautic on another subdomain ...
- 121
2
votes
0
answers
2k
views
postfix/sendmail can't read main.cf file
I'm trying to configure a mailserver, but when i run:
echo "test email" | mail -s "test" [email protected] -aFrom [email protected]
and check tail /var/log/mail.err I get Aug 8 ...
2
votes
2
answers
2k
views
SELinux - blocks postfix emails sending out from the Web Application
My System environment, is Centos-7.9, Apache2.4, Php-fpm, PHP-7.4
I have postfix setup to send emails from the website, which is working in stand-alone test emails and when I turn the SELinux off.
...
- 4,522
2
votes
0
answers
254
views
How to avoid Postfix sending emails without authentication even to users of the same domain
hopefully you could help me.
I just installed postfix and I am trying to configure to avoid spam.
The version I installed is 3.4.14
I am trying to configure posfix to have this behavior:
From External ...
2
votes
0
answers
587
views
I'm looking for a way to configure distance clustering of postfix and dovecot
I currently have a postfix server and dovecot server sharing files from an NFS server in the UK and the same config in Switzerland. I tried to mailsync but that appeared to lose emails, so then I ...
- 630
2
votes
0
answers
3k
views
Mail bounces: SMTPUTF8 is required, but was not offered
My mail server periodically sends out a newsletter to my clients. This is handled by a Perl script on the server. A few of the recipients names contain non-ASCII characters like ä, é, ö, etc. On my ...
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2
votes
0
answers
919
views
How does Postfix define an unlisted recipient or sender?
Postfix's documentation defines smtpd_reject_unlisted_recipient (default: yes) as
Request that the Postfix SMTP server rejects mail for unknown
recipient addresses, even when no explicit ...
- 63
2
votes
0
answers
1k
views
GMail not receiving email sent via PostFix
I have a VPN configured with Plesk.
(I have installed a SSL/TLS certificate, through Plesk, using Lets Encrypt. Everything seems good as far as I can tell, but I mention it as it also protects emails.)...
- 439
2
votes
0
answers
791
views
OpenDKIM doesn't reject unvalidated incoming emails
Last a few weeks I found that my OpenDKIM stopped rejecting incoming mails with no dkim-signature, bad-signature etc. Signing outgoing is OK, and according to the mail headers verifying provided, as ...
- 21