Using POP3 Protocol with Outlook Issue: Cannot Synchronize Subscribed Folders

Virtualmin
1
SYSTEM INFORMATION
OS type and version Rocky Linux 9.3
Webmin version 7.8.2
Virtualmin version 2.105
Related packages Dovecot

Hey Guys!

I have a very odd issue with POP3 protocol, I had to move my old Outlook messages from old server to the new one, I have exported all messages as Outlook’s PST file and imported it with the following settings:

Incoming Server
Server Type: POP3
Server Name: mail.DOMAIN.com
Port: 995
Encryption: SSL/TLS

Outgoing Server
SMTP Server: AMAZON SES
Encryption: SSL/TLS
Port: 465
And Other Credentials

Outlook successfully imported folders but suddenly stopped synchronizing and generated the following error for all emails using the POP3 protocol.

NOTE: Sync issue is not persistent, it works for a while and stops syncing for 4-5 hours and is back to work, Dovecot service is working and RoundCube can log in/Send and Receive

Task ''Synchronizing subscribed folders for EMAIL.' reported error (0x800CCC0E) : 'Outlook cannot synchronize subscribed folders for [EMAIL]. Error: Cannot connect to the server.

– Mailbird App –
I tried Mailbird and it completely imported all PST file and worked great for a couple of days but suddenly stopped and generated the following message:

[EMAIL] Error getting messages

This is typically caused by another email client checking for messages at the same time, or checking for messages too often.

I believe that the Mailbird message because I tried to use Outlook simultaneously.

The Dovecot service is working, and Rouncube can Login, Send and Receive messages.

Could it be related to the Dovecot?, Any Thoughts?

Thanks

2

in general POP3 is a one-way protocol – your server receives a message, later your PC connects and DOWNLOADS the msg to your PC’s hard drive, then immediately (or days later depending on your settings), DELETES the message from the server :smile:

often with having the server under your control, many will use the IMAP protocol — have you explored that as an alternative to POP3?

And I am guessing here – does RoundCube use IMAP?

Just some general random thoughts here !!

3

IMAP working properly my friend.

POP3 working but sometimes during the syncing process, it generates the issue I mentioned above.

I need to keep some emails using POP3 locally.

Thank You

4

POP3 protocol specifies that only one device can access at a time, so yes two email clients can clash.

Just curious, why use Roundcube?

5

RoundCube for testing send/receive when Outlook stops Syncing, but I’m asking about the error msg appears randomly, Outloook works perfectly for 5/6 hours and stops for a while and back to work.

Thank You

6

Something in the Router :grinning: Fixed after resetting the router settings. I won’t delete this post because it could be useful for others with the same case.

Thank You

7

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