Questions tagged [e-mailrelay]
The e-mailrelay tag has no usage guidance.
30
questions
7
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2
answers
1k
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Why and how would I transmit emails via several Mail Transfer Agents?
I read in some Mail-Relay explanation that emails can be delivered from the sender's MTA to the recipient's MTA via more MTAs. How does it work (I thought, the sender's MTA simply determines the ...
- 73
4
votes
2
answers
991
views
What is difference between using smtp vs relay transport type in postfix?
I am trying to setup MTA which should submit different intranet mail gateways based on the recipient's domain. For that I thinks transport_maps in postfix should be setup for selective domains; if ...
- 203
2
votes
1
answer
125
views
What difference does it make to implement a feature as policy service vs as milter in Postfix?
I am trying to implement MTA using Postfix. I am struck at how to implement standard services like SPF, DKIM etc. as well as some custom services. They can either be implemented as policy delegation ...
- 203
2
votes
2
answers
238
views
How to restrict based on combined usage of sender email and client ip address in postfix?
I have a MTA (postfix) with sasl implemented. I want that for a subset of users I can map their email address to a particular range of ips (separate for each email user). If a user tries to send email ...
- 203
2
votes
1
answer
219
views
Long established installation of postfix has become an open relay; how can I figure out how and stop it?
This server system has been serving email services since Red Hat v 1.1 (circa 1997 I think) and now is on Fedora Core 37; through many hardware and OS updates along the way it has been kept current. ...
- 1,298
1
vote
1
answer
156
views
Can I have more than one public keys saved in one selector for dkim?
The question is easy to understand, but it might be confusing. I understand that I can host multiple selectors for a DKIM record, but just out of curiosity, can I have multiple keys per selector in a ...
- 203
1
vote
2
answers
465
views
How can I use E-Mailrelay to implement DKIM?
I am trying to add DKIM to an existing windows server which is currently using IIS SMTP for outgoing mail.
It seems like this could be done by using E-Mailrelay. Unfortunately I could not find any ...
- 1,082
1
vote
1
answer
176
views
Why is it advised to disable relayhost when hosting mail server behind firewall?
I am trying to setup an MTA. While reading documentation I came across "Standard Configuration" for Running Postfix behind a firewall.
I am confused on this part:
IMPORTANT: do not specify ...
- 203
1
vote
2
answers
46
views
Can I log when the message arrival rate exceeds the message delivery rate in postfix?
I am trying to implement a MTA, on reading documentation of the postfix I found a parameter 'in_flow_delay' whose description in sort says 'Time to pause before accepting a new message, when the ...
- 47
1
vote
0
answers
218
views
What are typically the headers which I should oversign?
I am trying to setup MTA using Postfix and using opendkim for dkim signing. When I went through opemdkim documentation it have a field which is named 'OversignHeaders' document describes it as: "...
- 47
1
vote
0
answers
2k
views
Unable to send emails from Postfix via Gmail (connect to smtp.google.com: Connection timed out)
I want to configure a Ubuntu Linode VPS to send log information from Fail2Ban, Apache ModSecurity and other monitoring tools to my email address. However, I don't want to configure a whole email sever:...
- 111
1
vote
0
answers
587
views
How to prevent outgoing mails in postfix (or a mailcow instance)?
I want to use mailcow as an isolated mail server, so it's not supposed to send mails to the outside. The goal is to allow open registration on the mail server, and users should be able to communicate ...
- 11
0
votes
1
answer
345
views
Postfix: Order of evaluation of `smtpd_client_restrictions`, `smtpd_helo_restrictions`, `smtpd_relay_restrictions` and `smtpd_recipient_restrictions`
In what order does Postfix > 2.10 evaluate the following directives?
smtpd_client_restrictions
smtpd_helo_restrictions
smtpd_relay_restrictions
smtpd_recipient_restrictions
I read Postfix SMTP ...
- 279
0
votes
2
answers
574
views
Multiple mail server from different provider for one domain is possible?
I have searched in google before asking here. I got a mixed answer in google.
Can i have a multiple MX record from different mail providers?
Example,
Zoho Mail
[email protected]
[email protected]
...
- 189
0
votes
2
answers
253
views
Sendmail unable to email to specific domain
I have a server running Sendmail and is able to email to all domains except my company's email (company1.com). I have tested to sending to gmail and other email providers with no issues. Sendmail is ...
0
votes
1
answer
1k
views
Why is email sent from my AWS SES server cannot arrive on corporate-domain email, but arrive on mail service such as Gmail?
The summary:
email from SES did not arrive at user's corp domain email.
email from SES arrives at my corp domain email but is hosted at Gmail.
email from my private Gmail arrives at user's corp ...
- 103
0
votes
1
answer
41
views
(Postfix) set rate_delay for 2 sending domains to 1 receiving domain
Currently I own 2 sender domains aaa.com and bbb.com. The restriction is that:
Each domain can only send one email after another with a delay of 200 seconds.
Each domain can only send 100 emails ...
- 1
0
votes
0
answers
31
views
authenticate users in smtp relay server exim4
I'm configuring relay SMTP server for sending email alerts from my local network. I need to send emails alerts from services witch run on my servers. And I need to authenticate it: each service should ...
- 1
0
votes
0
answers
39
views
Postfix - Only allow relaying when sent from local user
At the moment, our Postfix + Dovecot mail system has two types of users: those with a full account and those with only a forwarder.
Users with a full account are in the virtual_aliases table pointing ...
- 101
0
votes
0
answers
84
views
Issue with 'delay_reject=no' and smtpd_helo_restrictions in Postfix
In Postfix MTA, I have set helo and client restrictions with the DISCARD policy. But since setting delay_reject=no I am getting this error just after connect from for some clients (don't know if they ...
- 203
0
votes
1
answer
21
views
What is meant by "Message sorting optimization records" in dovecot index?
Dovecot documentation here "https://doc.dovecot.org/developer_manual/design/indexes/index_file_format/#main-index" says that "Message sorting optimization records" are stored in ...
- 47
0
votes
0
answers
88
views
What is difference between uidvalidity and list index file in dovecot?
Dovecot's document notation says that uid-validity file store IMAP UID to filename mapping but it also says list.index file also store same. If it's so what is need of two files.
- 203
0
votes
1
answer
152
views
In postfix can I mention sender access map in client restriction?
It's a question out of curiosity rather than necessity. What should happen say I place sender access map inside smtpd_client_restrictions and also place client access map in smtpd_sender_restrictions ...
- 203
0
votes
1
answer
99
views
In postfix how parent_domain_matches_subdomains helps rejecting mail for subdomains?
Based on the standard configuration given in https://www.postfix.org/STANDARD_CONFIGURATION_README.html#firewall the parent_domain_matches_subdomains = debug_peer_list, smtpd_access_maps should help ...
- 203
0
votes
2
answers
3k
views
Postfix relay to Office 365 - DNS configuration
To reduce the likeliness of email being flagged as SPAM, I believe these are the few things that should be done on email servers:
Hostname resolves to a valid IP e.g. mail.example.com to 1.1.1.1
...
- 359
0
votes
0
answers
59
views
what is required to setup on email server to accept relay email from postfix installed on diff VM
[ServerA+postfix] --relay email--> [mailserver+companydomain.com] --send email--> ([email protected])
I need to set up an email alert sent from ServerA to the intended recipients ...
0
votes
0
answers
131
views
Postfix relay error "mail for example.com loops back to myself"
Good afternoon. There is a mail server (smtp relay) on ubuntu 22.04. This is the core of the server. There are mail accounts on Google Workspace, and the transfer of outgoing letters from these ...
- 1
0
votes
1
answer
420
views
How to configure Exim4 to relay emails from authenticated users in various locations
I have a Debian cloud server with Exim4 running and serving emails with DMARC, SPF, and DKIM properly set up. I can ssh into the server and send and receive encrypted emails successfully. Dovecot is ...
- 3
0
votes
0
answers
95
views
Peer to peer asynchronous delivery with postfix?
I want to privately peer-to-peer send emails between me and my friend's self hosted personal email servers. How can I make sure a message from me (A) gets delivered to my friend (B), if me and my ...
-2
votes
2
answers
2k
views
Inetmgr6.exe missing on Windows server 2022, SMTP relay still working
4 months ago, I have in-place upgraded a 2K8R2 server to 2K22.
It had the SMTP relay function, and this feature is still working on Server 2022. (I did the export-import function to get the settings ...
- 1