I hate Microsoft Exchange but I have to use it

You should first ask your IT department whether or not they have enabled IMAP for the Exchange server. If it isn't then ask them to do so. MailMate should work with that (although Exchange is quite buggy).

Oh, wait. Which SMTP server are you using? You do not need to use the one for Exchange or Davmail. You can use any SMTP server. Including one running on your own machine (postfix).

I asked them, and they tried desperately. They do have an IMAP server and it works for receiving all the time. I can only send when Im on the network.
I tried using gmails SMTP but then my mails are kicked back to me, as long as Im not on the network at work that is.. Its very very annoying.
At this point I might just continue using MailMate and avoid sending messages to the mailing lists I have at work. My everyday workflow is much more important than being able to respond to every single email.

And I had zero issues with MailMate in Lund, also on exchange.

Thanks for your help Benny! Your great as usual.

If IMAP works for receiving then you should use that.

The problem is then sending. Note that when using Gmail's SMTP then you need to take special care when using a different From address (than used for the Gmail account). Read more here.

You write you “get bumped unless I am on the same network”. Is the problem also the From address in this case?

I looked at the error message again: Could the error pattern be that it fails when you have recently sent a message and then try to send a second message (after a certain number of minutes)?

Its always when Im sending. And the error pattern with DavMail seems to be
fairly consistent. It happens almost every time.

Can I set mailmate so that I always respond with my gmail adress and via the gmail smtp server? Even if someone mails my mpib (exchange) adress?

That would save me some hassle.

Since DavMail does work, but behaves oddly, there must be some way to get it running properly. Ill dig deeper.

Thanks again for your help Benny,

Johan

If I understand you correctly then you can simply change the SMTP settings of the Davmail account in MailMate (double click it under SOURCES in the mailbox outline). And also change the email address of the account if you want the “From” header to be your Gmail address.