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I did a mistake on the issue description: It's the IMAP authentication that not working anymore, you can see my configuration below:</div>
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<img style="width: 865px; height: 451px; max-width: initial;" class="w-1467 h-765" width="865" height="451" size="87053" contenttype="image/png" data-outlook-trace="F:1|T:1" src="cid:4046d320-0e6f-4318-be6f-644ff9ba36e9"><br>
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On exchange online side, I see SMTP authentication sucessfull from ZendTo, but no log about IMAP authentication from ZendTo (no sucess nor fail, nothing). It's like ZendTo is not even trying to loggin through IMAP.</div>
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On front side (try to log to the dashboard) I see a message telling me that the username or the password is not correct:</div>
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<img style="width: 457.224px; height: 165px; max-width: initial;" class="w-1053 h-380" width="457" height="165" size="52014" contenttype="image/png" data-outlook-trace="F:1|T:1" src="cid:c4deba4b-01ac-41bf-8b30-d263b9b84445"><br>
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Thank you very much.</div>
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Arnaud</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>De :</b> ZendTo <zendto-bounces@zend.to> de la part de arnaud Chevalier via ZendTo <zendto@zend.to><br>
<b>Envoyé :</b> mercredi 6 juillet 2022 18:08<br>
<b>À :</b> zendto@zend.to <zendto@zend.to><br>
<b>Cc :</b> arnaud Chevalier <arnaud_chevalier@hotmail.fr><br>
<b>Objet :</b> [ZendTo] SMTP authentication on Exchange Online suddenly not working</font>
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Dear all,</div>
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I hope you are fine.</div>
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I have a sudden issue on my ZendTo (v6.11-2), I can't connect anymore through the smtp authentication on Exhange Online. (smtp.office365.com / port 587 / tls on)</div>
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But the account used to send daily reports email, can connect on the smtp of exchange online and send emails... So the smtp authentiction obviously working fine...</div>
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MFA is not activated on the account.</div>
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There have been no change on my ZendTo install or on the OS.</div>
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Do you have an idea?</div>
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Thank you very much.</div>
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Arnaud</div>
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