[External] IMAP connection lost while sending mail

[Kevin A. McGrail]

On 5/6/2022 3:53 AM, Philipp Ewald wrote:
>
> we have a strange problem.
>
> Costumer use Outlook to connect to our IMAP and SMTP Server.
> While sending Mails Outlooks reports connection lost. In Mail log 
> there is no reason logged or something else.
>
> What i dont understand is that IMAP lose connetion while using SMTP. 
> Outlloks reports problem by moving mails into Send dir.
>
> Is that a Outlook problem?
>
> i have enables debug logging and cant see any reason :(
>
> Network was already testet. 

Morning Philipp,

I would do a couple of things to troubleshoot:

1 - Time it. Is it hitting a specific time and giving up?

2 - Does the email have any specific content?

3 - Do they have anything like A/V software that might be acting to try 
and proxy / scan the email?

4 - Try putting thunderbird on the same machine for the same account 
with the same email.  Does that work?

Regards,

KAM