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Unable to receive e-mails anymore

I am standing up my own e-mail server with CentOS 7, postfix and dovecot. I first followed this: https://likegeeks.com/linux-mail-server/. I could send/receive e-mails. Then I completed this: https://www.linode.com/docs/email/po...b-on-centos-7/. I can no longer receive e-mails now.

Quote:

Originally Posted by sniper8752 (Post 6061798)

What happens when you sent email from “outside”? Do you get a BOUNCE message? What does it say?
What do your mail logs say?
What did you specifically change?

It says it was sent. No messages (or bounce messages).
I am not sure if this has to do with the test e-mail that I send or not (say I send it from Yahoo, but I don't see any mention of "yahoo" in the maillog file):

Code:

Nov 26 00:49:22 ip-<IP> postfix/pickup[2776]: B721X89VLP6: uid=0 from=<root>

Nov 26 00:49:22 ip-<IP> postfix/cleanup[2882]: B721X89VLP6: message-id=<20191126004922.B721X89VLP6@mail.mydomain.com>

Nov 26 00:49:22 ip-<IP> opendkim[928]: B721X89VLP6: no signing table match for 'root@mail.mydomain.com'

Nov 26 00:49:22 ip-<IP> opendkim[928]: B721X89VLP6: no signature data

Nov 26 00:49:22 ip-<IP> postfix/qmgr[1074]: B721X89VLP6: from=<root@mail.mydomain.com>, size=1483, nrcpt=1 (queue active)

Nov 26 00:49:22 ip-<IP> postfix/smtp[2886]: B721X89VLP6: to=<root@mail.mydomain.com>, orig_to=<root>, relay=none, delay=0.16, delays=0.12/0.01/0.04/0, dsn=5.4.4, status=bounced (Host or domain name not found. Name service error for name=mail.mydomain.com type=A: Host not found)

Nov 26 00:49:22 ip-<IP> postfix/cleanup[2882]: GN84B3FC4: message-id=<20191126004922.GN84B3FC4@mail.mydomain.com>

Nov 26 00:49:22 ip-<IP> postfix/qmgr[1074]: GN84B3FC4: from=<>, size=3529, nrcpt=1 (queue active)

Nov 26 00:49:22 ip-<IP> postfix/bounce[2887]: B721X89VLP6: sender non-delivery notification: GN84B3FC4

Nov 26 00:49:22 ip-<IP> postfix/qmgr[1074]: B721X89VLP6: removed

Nov 26 00:49:22 ip-<IP> postfix/smtp[2886]: GN84B3FC4: to=<root@mail.mydomain.com>, relay=none, delay=0, delays=0/0/0/0, dsn=5.4.4, status=bounced (Host or domain name not found. Name service error for name=mail.mydomain.com type=A: Host not found)

Nov 26 00:49:22 ip-<IP> postfix/qmgr[1074]: GN84B3FC4: removed

I followed all of the steps in the second tutorial.

Quote:

Then I completed this: https://www.linode.com/docs/email/po...b-on-centos-7/.

Undo what you did in that process and test whether functionality returns.

It actually looks like I am receiving a bounce e-mail now:
The recipient server did not accept our requests to connect. [mydomain.com <IP>: timed out]

It looks like the whole service is not being exposed. Have you tried connecting from outside through telnet/nc to make sure that the ports/service are available?

Can you show use your postfix configuration exactly (main.cf and master.cf)?

You're not giving enough information. Are you sending mail to mail.mydomain.com from yahoo or to mydomain.com? Maybe you don't have the right DNS entries for one or the other. There are quite a few possible scenarios.

what to do about bounce email ?

I was able to solve it. This can now be closed.

Thank you for your ample explanation regarding the solution... We've all been enlightened.

There are several things which could be affecting your email: We've got a technical problem with email.