Page 1 of 1
Postfix and mails from outlook.com
Posted: 26 Jun 2020 13:13
by samrein
Hello,
we have trouble with some mails from outlook.com domains.
After few weeks with many trouble with cutoumers i am disable greylisting on my efa4 server.
Now we have complaints that the messages will not be delivered.
The only message on the server is:
Code: Select all
Jun 26 13:38:35 server postfix/smtpd[25403]: 49tZdl6Svjz9yvBS: client=xxx.outbound.protection.outlook.com[40.107.7.81]
Jun 26 13:43:36 server postfix/smtpd[25403]: timeout after BDAT (17968 bytes) from xxx.outbound.protection.outlook.com[40.107.7.81]
Jun 26 13:43:36 server postfix/smtpd[25403]: disconnect from xxx.outbound.protection.outlook.com[40.107.7.81] ehlo=2 starttls=1 mail=1 rcpt=1 bdat=2 commands=7
ICMP Packets on the firewall are allowed.
Where can i search for this error?
Hope, anyone can help me.
Regards
Stefan
Re: Postfix and mails from outlook.com
Posted: 26 Jun 2020 18:34
by pdwalker
viewtopic.php?t=1733
[root@efa4 ~]# update_sqlgrey_config
< bunch of things happen >
this adds several things to the sqlgrey whitelists, including adding this to /etc/sqlgrey/clients_fqdn_whitelist
+# Outlook.com users, retries do not come from the same server.
+*.outbound.protection.outlook.com
I think this will accomplish what you're looking for.
I don't know if restarting the sqlgrey service was necessary, but I did it anyway.
[root@efa4 sqlgrey]# service sqlgrey restart
Redirecting to /bin/systemctl restart sqlgrey.service
Re: Postfix and mails from outlook.com
Posted: 29 Jun 2020 06:44
by samrein
Hi pdwalker,
I have deactivated greylisting, does it still have an effect?
The entry is included in my "clients_fqdn_whitelist
.
Greetings
Stefan
EDIT:
i have set
smtpd_discard_ehlo_keywords = chunking, silent_discard
and now the mails running.
Whether there are any better options?
Re: Postfix and mails from outlook.com
Posted: 29 Jun 2020 19:47
by pdwalker
I would leave greylisting enabled because greylisting does result in a lot of discarded spam.
Once you've updated your domain whitelist, you shouldn't have any problem receiving messages from outlook.com. Send some to yourself and verify.
As for "smtpd_discard_ehlo_keywords = chunking, silent_discard", I have no idea what that is and what it is for. I could look it up and see.
Why did you add this?
Re: Postfix and mails from outlook.com
Posted: 30 Jun 2020 13:05
by samrein
Hi Pdwalker,
thanks.
I will reactivate greylisting.
I actived "smtpd_discard_ehlo_keywords = chunking, silent_discard", because messages from outlook.com didn't reach me anymore. i also had no error message in the maillog. only.
Code: Select all
Jun 26 13:38:35 server postfix/smtpd[25403]: 49tZdl6Svjz9yvBS: client=xxx.outbound.protection.outlook.com[40.107.7.81]
Jun 26 13:43:36 server postfix/smtpd[25403]: timeout after BDAT (17968 bytes) from xxx.outbound.protection.outlook.com[40.107.7.81]
Jun 26 13:43:36 server postfix/smtpd[25403]: disconnect from xxx.outbound.protection.outlook.com[40.107.7.81] ehlo=2 starttls=1 mail=1 rcpt=1 bdat=2 commands=7
Please have a look at:
http://www.postfix.org/BDAT_README.html
After i set "smtpd_discard_ehlo_keywords = chunking, silent_discard" mails from outlook.com reached me.
Greetings
Stefan
Re: Postfix and mails from outlook.com
Posted: 02 Jul 2020 07:23
by pdwalker
Useful feedback, thanks. I'll be looking it over carefully.