Hi John, Thank you for the reply. Actually it was setup like this by another member, who left the team/company recently. Now it came to me to handle that responsibility. That's how I got in to this. At present I am not able to migrate/upgrade immediately. Because it sends emails around 100K+ emails everyday and I do not want to disturb that.
Coming back to your question, Actually the connection is : O365/Outlook >> SMTP Gateway Server >> testing.test.com >> 2 POP3 servers. Actually "testing.test.com", that is FQDN name set in F5 load balancer, where it is having the 2 POP3 servers to route the emails. When the email was sent from Outlook/O365, first it goes to SMTP Gateway Server. Now the SMTP Gateway server has the postfix rule to send it to " testing.test.com". In this location, I am getting the error in SMTP Gateway Server, where it is not able connect ( lost connection with testing.test.com [xxx.xxx.xxx.xxx] while receiving the initial server greeting). In SMTP Gateway server, instead of "testing.test.com", if i give the name/ip of any POP3 server, then email delivery is happening successfully to that POP3 server. The above error is coming only when i use the fqdn " testing.test.com", instead of direct POP3 server. Please let me know if you need any more details. Could you please help me here. Thanks, Kishore Potnuru On Thu, Apr 23, 2020 at 7:13 PM John Stoffel <[email protected]> wrote: > >>>>> "Kishore" == Kishore Potnuru <[email protected]> writes: > > Kishore> I have the dovecot version 2.0.9 installed on RHEL linux 6.10 > Kishore> version. It's a single/standalone Live server. > > You should really upgradr your setup. > > Kishore> Now I have created another server with the same configuration > Kishore> for the resilince purpose. I also tested and I am able to > Kishore> send the emails to both of the dovecot servers > Kishore> separately/individually. They are working fine. > > Dovecot doesn't do the mailing between systems, so i assume you've got > postfix configured? And do you have shared storage behind your two > dovecot instances so that your users don't have to login to multiple > systems to get emails? > > Did you read the docs at: > > https://doc.dovecot.org/admin_manual/dovecot_cluster_architecture/ > > Kishore> Now I have added those two servers under a F5 load balancer > Kishore> and created a FQDN (example: testing.test.com). I changed the > Kishore> rules to send the traffic to FQDN "testing.test.com", where > Kishore> it should redirect the email to one of those 2 servers. > > So how is your F5 configured to work when one server is down? > > Kishore> When I sent the email to FQDN "testing.test.com", I am getting > the below error. > > Kishore> pf1_inbd/smtp[30292]: 66A5F5F6: to=<[email protected]>, > Kishore> relay=testing.test.com[xxx.xxx.xxx.xxx]:25, delay=13, > Kishore> delays=0.09/0.08/13/0, dsn=4.4.2, status=deferred (lost > Kishore> connection with testing.test.com [xxx.xxx.xxx.xxx] while > Kishore> receiving the initial server greeting) > > Kishore> Could you please let me know how to fix this issue? It's a great > help for me. > > Sounds like you haven't actually setup your system correctly. But > we're not going to be able to help until you provide more details. > It's also not clear from the about log file *which* server gave you > this error. > > It would be smarted to start from scratch with an upto date install of > dovecot (and postfix in my opinion) according to the Dovecot docs > above, and test that out in a test environment. Then you would use > 'doveadm' sync to migrate user accounts over to the new system. > > John > > >
