I can receive but not send emails and already tried the tips of help page

Hi, I just changed my Apple Mail to Thunderbird and I with my two suppliers (a University for work-mail server) and an e-mail provider in Germany for private messages, I can receive but not send messages. I tried everything on the "can't send messages" page https://support.mozilla.org/en-US/kb/cannot-send-message, it doesn't work.

I use Mac OSx Sierra on a Macbook from 2012. Thanks for your help!

These parameters appear to be good. It is rare that someone looking for help provides useful information you have with these screenshots. Awesome.

Cannot send mail has a bit more troubleshooting info.

Make sure Thunderbird is in online mode, not in offline mode: click on "file-> Offline; "Work offline" must be unchecked.

Temporarily disable anti-virus & firewall and test sending.

Disable all modules of Thunderbird and test sending.

Beyond that, I am unable to help him.

Tags: Thunderbird

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