• The BIND DNS server has already been deprecated and removed from Plesk for Windows.
    If a Plesk for Windows server is still using BIND, the upgrade to Plesk Obsidian 18.0.70 will be unavailable until the administrator switches the DNS server to Microsoft DNS. We strongly recommend transitioning to Microsoft DNS within the next 6 weeks, before the Plesk 18.0.70 release.
  • The Horde component is removed from Plesk Installer. We recommend switching to another webmail software supported in Plesk.

5 minute server response delay when using qmail SMTP, "AUTH LOGIN" on port 25

P

petersonj

Guest
I am new to centOS, plesk, and qmail but have been administrating many Ubuntu and Red Hat servers for quite some time. I have never had a problem quite like this. I just started using a new hosting company and everything went well but... When ever I use / enable SMTP authentication in the Plesk panel the server takes around 5 minutes to respond after the "AUTH LOGIN" command is issued from any email client. To verify this I manually started a SMTP session with my server, see below; as can be seen as soon as the "AUTH LOGIN" command is issued the server stops responding and eventually after about 5 minutes the "334 VXNlcm5hbWU6" response finally comes. After that everything is quick. I also tested this procedure locally on the server itself and it works fine there is no delay. This only happen on port 25, if I enable port 587 it also works fine. I am using some older technology that needs SMTP with AUTH on port 25. I am baffled.... Thanks in advance.

Trying 70.32.73.39...
Connected to mail.startechplus.com.
Escape character is '^]'.
220 startechplus.com ESMTP
EHLO
250-startechplus.com
250-AUTH=LOGIN CRAM-MD5 PLAIN
250-AUTH LOGIN CRAM-MD5 PLAIN
250-STARTTLS
250-PIPELINING
250 8BITMIME
AUTH LOGIN

<<-------------------------------- 5 Minute Delay!!! Why???--------------------->>

334 VXNlcm5hbWU6
quit
334 UGFzc3dvcmQ6
quit
535 auth failure
quit
221 startechplus.com
Connection closed by foreign host.

I have search the forums and my config files look correct. I am not having the same problem that others have posted about 30 second delays before the banner is shown and -Rt0 fixes. I have disabled spam filtering.
 
Make sure you have a reverse DNS entry setup for your server IP address
 
Back
Top