Hi,
it seems that this issue is Outlook problem, but it might be worth asking.
I noticed, that Outlook somehow automatically formats mail recipients with single quotes around names:
'Foo Bar' <foo.bar@domain.com>
in this case, my mail is stuck in Outlook's OUTBOX folder.
But if mail is formatted without single quotes, everything is OK.
Outlook is somehow stupid or smart, to convert all addresses into single-quotes format, so after few days, I have problems with all my mails.
What I want to check is if maybe MAILENABLE PRO has some limitations or problems with single quotes in mail address?