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Results tagged with postfix
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user 229501
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
vote
Accepted
Postfix Restrictions sender recipient
You may need to alter /etc/postfix/access to contain a more flexible match. …
- 507
0
votes
1
answer
74
views
Large numbers of "relay access denied" from same sender with helo=<[127.0.0.1]>
I've noticed large numbers of these lines in our logs recently (where ourdomain.com is a domain we control and 14.242.x.x is an IP outside our network):
Oct 27 20:59:38 server postfix/smtpd[26781]: NOQUEUE …
- 507
1
vote
How to deal with outgoing spam flooding with Postfix
SASL-authenticated clients using your mail server to send out spam or malware are usually the result of botnets. You can catch most if not all of botnet-like behaviour using postfwd rules and the Post …
- 507
0
votes
1
answer
49
views
Different spam filter method for sasl-auth clients?
Using a standard Ubuntu postfix setup (Ubuntu 22.04), I would like to filter mail as follows:
Incoming submission and smtps (the vast majority of mail): SPF and RBL checks (I'm using policyd.pl), then … n - - smtpd
-o smtpd_sasl_auth_enable=no
-o smtpd_discard_ehlo_keywords=silent-discard,dsn
submission inet n - n - - smtpd
-o syslog_name=postfix …
- 507
0
votes
2
answers
546
views
Postfix multiple IPs: which to use for SMTP AUTH?
I am setting up a mail server which has separate IP addresses for sending and receiving mail. My config looks like this:
# The addresses we send out on:
smtp_bind_address = 185.xx.xx.101
smtp_bind_ad …
- 507
0
votes
1
answer
269
views
Postfix: Optimising order of spam checks?
I have a mail server (postfix v3.3) on a VPS running Ubuntu 18.04, processing both inbound and outbound mail (I have some websites sending mail, and some SASL auth users with accounts on the machine) with … disable_vrfy_command = yes
smtpd_helo_required = yes
smtpd_client_restrictions =
check_client_access hash:/etc/postfix/blacklist,
permit_mynetworks
smtpd_helo_restrictions = …
- 507
4
votes
2
answers
9k
views
Dovecot doesn't create /var/spool/postfix/private/auth
/smtpd[13445]: fatal: no SASL authentication mechanisms
Oct 28 14:18:51 lorina postfix/master[13440]: warning: process /usr/lib/postfix/smtpd pid 13445 exit status 1
Oct 28 14:18:51 lorina postfix/master … have:
# Postfix smtp-auth
unix_listener /var/spool/postfix/private/auth {
mode = 0666
}
However, I see that /var/spool/postfix/private/auth doesn't exist on the new machine. …
- 507
1
vote
OpenDKIM not signing mail sent to relay host with Ubuntu 18.04
With the Postfix configuration on Ubuntu 18.04, I had to add masquerade_domains = domain.com to main.cf, whereas Ubuntu 14.04 did not need this. …
- 507
1
vote
Accepted
Dovecot doesn't create /var/spool/postfix/private/auth
So it wasn't starting properly and therefore not creating the socket in /var/spool/postfix/private/auth. …
- 507
0
votes
1
answer
2k
views
OpenDKIM not signing mail sent to relay host with Ubuntu 18.04
If I shut down the opendkim daemon on the sender, I see postfix complain that it can't connect to the opendkim socket. …
- 507
0
votes
0
answers
9
views
postscreen "deep protocol" tests and multiple MX IPs?
In the Postfix postscreen readme, it says the main limitation of "after 220 greeting" tests is that a new client must disconnect after passing these tests. … How is this done in Postfix exactly?
Can I assume something like the following, where 150.xxx.xx.12 and 150.xxx.xx.12 are MX A records in my zone file pointing to the same host name? …
- 507
0
votes
0
answers
10
views
Should smtp_helo_name always be the same as your MX record?
I can't seem to satisfy HELO checks on SPF records in all cases. I have an SPF record for my domain like this:
"v=spf1 mx -all"
The MX records in the zone are:
mx0.mydomain.org.uk. 3600 IN A …
- 507
0
votes
1
answer
445
views
Postfix: How to malware & spam scan outgoing SMTP SASL auth users?
I have a server (Ubuntu 18.04) running Postfix. … That's all OK, and looks like this in main.cf:
smtpd_sender_restrictions =
check_client_access cidr:/etc/postfix/internal_clients_filter,
permit_mynetworks,
reject_unknown_sender_domain
and …
- 507
0
votes
Accepted
Postfix: How to malware & spam scan outgoing SMTP SASL auth users?
owned by amavis user+group) and set final_spam_destiny to D_DISCARD
40-policy_banks:
$interface_policy{'10024'} = 'INTERNAL';
$policy_bank{'INTERNAL'} = { # mail originating from clients in cidr:/etc/postfix … listener on port 10025
};
In Postfix main.cf:
smtpd_sender_restrictions =
check_client_access cidr:/etc/postfix/internal_clients_filter,
permit_mynetworks,
reject_unknown_sender_domain …
- 507