• Our team is looking to connect with folks who use email services provided by Plesk, or a premium service. If you'd like to be part of the discovery process and share your experiences, we invite you to complete this short screening survey. If your responses match the persona we are looking for, you'll receive a link to schedule a call at your convenience. We look forward to hearing from you!
  • We are looking for U.S.-based freelancer or agency working with SEO or WordPress for a quick 30-min interviews to gather feedback on XOVI, a successful German SEO tool we’re looking to launch in the U.S.
    If you qualify and participate, you’ll receive a $30 Amazon gift card as a thank-you. Please apply here. Thanks for helping shape a better SEO product for agencies!
  • 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.

SMTP Authentication Problem! HELP!

M

Michael MacDonald

Basic Pleskian
Greetings:

We are in the middle of migrating from our 9.3 Plesk server to 10.3.1 server. Yesterday afternoon we started seeing errors in POP3 authentication. Users get the following error:

"The server responded: -ERR Server does not support PLAIN text authentication."

We have made no change to the server between when it was working and when it started to fail. IMAP does work and mail appears to be flowing.

When checking mail, I can see in the maillog that the client does attempt to authenticate. I can see the IP appear in the log, then nothing. I have searched in the forum and found some entries that are quite old and made some suggestions about updating certain qmail modules.

I did find that I can pull mail if my POP3 client is set to use SSL (port 995). I don't want to enable this without notifying the user community of the change.

How can this be disabled?

Please let me know if you have any suggestions on fixing or troubleshooting this problem.
 
Last edited:
Hi,

No idea how it got in this state (possibly you've been using the pci-compliance resolver which may cause it? No idea as i don't use it), but assuming you're on RHEL/Centos check in your /etc/courier-imap/pop3d file that you have the following line :

POP3AUTH="LOGIN CRAM-MD5 PLAIN"

If its something different then comment it out and add the one above and restart courier-imap :

service courier-imap restart

Paul.
 
Thank you

Your suggestion worked perfectly. THANK YOU.

I honestly don't know how the change happened. PCI compliance is on my to-do list. Other than my firewall, I have not started down that path yet.

I appreciate your time and support on this.

Have a good day.
 
You must log in or register to reply here.

Similar threads

X
Question How To Setup Outgoing Only Mail
Replies
5
Views
983
george-the-guy
G
A
Question Alternative ways to forward emails
Replies
2
Views
800
Aslanj
A
flederwiesel
Question `SSLVerifyClient require` -> AH10158: cannot perform post-handshake authentication
Replies
0
Views
683
flederwiesel
flederwiesel
M
Issue Outgoing Mail Control is always 0
Replies
1
Views
341
MarketPC
M
R
Issue Unable to send emails using SMTP
Replies
9
Views
1K
Robin McDermott
R
Back
Top