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Question Some server domain email accounts accept encrypted passwords, others do not - why? Appears to be some obscure setting in a service plan?

MHC_1

Regular Pleskian
Server operating system version
AlmaLinux 9
Plesk version and microupdate number
Plesk Obsidian 18.0.73 Update #4
We have server version:

Plesk Obsidian 18.0.73 Update #4​

Web Host Edition​

Last updated on Nov 19, 2025 03:50 AM

Which means things like https://support.plesk.com/hc/en-us/...n-type-after-update-to-Plesk-Obsidian-18-0-73 doesn't apply. However, we have two domain accounts which are both on the same server and both successfully connect to emails -- but one connects with encrypted password (CRAM-MD5) and the other connects via PLAINTEXT , but we can't see how to make the Plaintext connection work using Encrpyted password.

We have found these two accounts "encrpyted_domain" and "plaintext_domain" are on different subscriptions with different Service Plans and I assume something in these settings enable/disable email password encrpytion, but digging into the subscription and/or service plan options, we can't see what to tweak so that both subscriptions/service plans enable email password encryption.

All connections are via SSL/TLS
 
@MHC_1 , please execute the repair utility for the domain names related to the issue and let us know if it returns any errors:

Code:
plesk repair mail -v example.com -y
 
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