TB 56.2.0, win7 with gmail and ms exchange server account via ExQuilla and the last account blocks one particular emailaddress but gmail does not.
when I send email to the same emailadress from the web access to the exch server, the email comes through. Sending from my gmail account makes it. TB gives no warning and the email shows up as sent in "sent elements" - but is not received.
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Once the message is in the Sent folder it has been sent. What happens next is not related to Thunderbird anymore. You should check with your email provider or server admin.
Thanks for quick answer. The funny thing is when I log on to ms exchange server web access, I can send to this address. If TB is clear, there might be a trouble with how TB/ExQullla and ms exch server interact. Do anyone have a clue?