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Postings by Patrick Mahan

Limiting mail relay

All,

I am trying to understand how I am being a mail relay for (what I believe)
are unauthorized users. I have the following postfix config set -

smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authentication,
reject_unauth_destination

mynetworks_style = subnet

However, an account seemingly seems to be used as a relay. The user is
complaining about seeing tons of MAIL REJECT messages.

Changing the imaps port-number

I am trying to change the imaps port-number to a non-standard port (9999)
since it seems that buisness.comcast.net is intercepting the standard imaps
port number and repeated emails requesting that they stop have been ignored.

This is only an issue when I am trying to access my personal mail server
when I am away from home.

I currently have the following configured in 10-master.conf -

service imap-login {
inet_listener imap {
address = 127.0.0.1, ::1
port = 143
}
inet_listener imaps {
port = 9999
}
process_min_avail = 3
service_count = 0
vsz_limit = 1 G
}

But I do

Trying to debug postfix 'unknown mail transport error'

FreeBSD 11.2, Postfix 3.3.2, Dovecot 2.3.4

Random user verification failures are occurring and I am not sure why.

Here's an example -

From /var/log/maillog:

Failure:

Jan 21 12:20:41 ns postfix/smtpd[31736]: NOQUEUE: reject: RCPT from
mta2.email.famousfootwear.com[136.147.183.86]: 450 4.1.1 < ... at mahan dot org>:
Recipient address rejected: unverified address: unknown mail transport
error; from=<
bounce-299_HTML-404541337-2436561-7222883- ... at bounce dot email.famousfootwear.com>
to=< ... at mahan dot org> proto=ESMTP helo=<mta2.email.famousfootwear.com>
....
Jan 21 12:20:41 ns dovecot: lmtp(31763): Conn