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Dear All,</div>
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<br>
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If anyone have the same issue with IMAP authentication with Exchange Online, please find below how I temporarily solved it :</div>
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<br>
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I reactivated the IMAP basic authentication by following this official process : <a href="https://techcommunity.microsoft.com/t5/exchange-team-blog/basic-authentication-and-exchange-online-june-2021-update/ba-p/2454827" id="LPlnkOWALinkPreview">https://techcommunity.microsoft.com/t5/exchange-team-blog/basic-authentication-and-exchange-online-june-2021-update/ba-p/2454827</a></div>
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<a target="_blank" id="LPImageAnchor730699" href="https://techcommunity.microsoft.com/t5/exchange-team-blog/basic-authentication-and-exchange-online-june-2021-update/ba-p/2454827"><img id="LPThumbnailImageId730699" alt="" height="116" style="display: block;" width="240" src="https://techcommunity.microsoft.com/t5/image/serverpage/image-id/289315i6DBE257934C0D79C?v=v2"></a></div>
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<a target="_blank" id="LPUrlAnchor730699" href="https://techcommunity.microsoft.com/t5/exchange-team-blog/basic-authentication-and-exchange-online-june-2021-update/ba-p/2454827" style="text-decoration: none; color: var(--themePrimary);">Basic Authentication
and Exchange Online – June 2021 Update</a></div>
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Update: For latest information related to basic authentication in Exchange Online, please see Basic Authentication and Exchange Online – May 2022 Update. It’s been a few months since our last update on Basic Authentication in Exchange Online, but we’ve been
busy getting ready for the next phase of the process: turning off Basic Authentication for tenants that don’t use it, and ...</div>
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techcommunity.microsoft.com</div>
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Like that, I have until 1<span><sup>st</sup> of october to properly migrate my ZendTo authentication to AD or SAML.</span></div>
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<span><br>
</span></div>
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<span>Kind regards,</span></div>
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<span><br>
</span></div>
<div style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
<span>Arnaud</span></div>
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<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>De :</b> ZendTo <zendto-bounces@zend.to> de la part de arnaud Chevalier via ZendTo <zendto@zend.to><br>
<b>Envoyé :</b> jeudi 7 juillet 2022 10:52<br>
<b>À :</b> HILLENBRAND Marita <m.hillenbrand@montgeron.fr><br>
<b>Cc :</b> arnaud Chevalier <arnaud_chevalier@hotmail.fr>; ZendTo Users <zendto@zend.to><br>
<b>Objet :</b> Re: [ZendTo] SMTP authentication on Exchange Online suddenly not working</font>
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<span class="x_x_elementToProof" style="font-size:12pt; margin:0px; background-color:rgb(255,255,255)">Hello Marita,</span>
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<br>
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Thank you for your answer. </div>
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<span class="x_x_elementToProof" style="font-size:12pt; margin:0px; background-color:rgb(255,255,255)">Basic authentication is indeed disabled for IMAP on my tenant, but since march 2022. Zendto authentication was still working fine two days ago (Users have
app password because MFA is enabled).</span><br>
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<span class="x_x_elementToProof" style="font-size:12pt; margin:0px; background-color:rgb(255,255,255)">I will try configure SAML, did you used this tutorial ? => <a href="https://zend.to/azure" id="LPlnk157823">https://zend.to/azure</a></span></div>
<div class="x_elementToProof" style="font-family:Calibri,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
SAML works also fine if users have MFA enable?</div>
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</span></div>
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<span class="x_x_elementToProof" style="font-size:12pt; margin:0px; background-color:rgb(255,255,255)">Kind regards,</span></div>
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<span class="x_x_elementToProof" style="font-size:12pt; margin:0px; background-color:rgb(255,255,255)"><br>
</span></div>
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<span class="x_x_elementToProof" style="font-size:12pt; margin:0px; background-color:rgb(255,255,255)">Arnaud</span></div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>De :</b> HILLENBRAND Marita <m.hillenbrand@montgeron.fr><br>
<b>Envoyé :</b> jeudi 7 juillet 2022 10:19<br>
<b>À :</b> arnaud Chevalier <arnaud_chevalier@hotmail.fr><br>
<b>Cc :</b> ZendTo Users <zendto@zend.to><br>
<b>Objet :</b> RE: SMTP authentication on Exchange Online suddenly not working</font>
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<p class="x_x_MsoNormal"><span style="">Hello,</span></p>
<p class="x_x_MsoNormal"><span style=""> </span></p>
<p class="x_x_MsoNormal"><span style="">Your problem might be due to Microsofts new security policy : They’re progressively turning off Basic Authentication protocols, wich includes IMAP, see joined message.</span></p>
<p class="x_x_MsoNormal"><span style="">Luckily, SMTP will be still available.</span></p>
<p class="x_x_MsoNormal"><span style=""> </span></p>
<p class="x_x_MsoNormal"><span style="">We’re using SAML authentication for our Office 365, it still works.</span></p>
<p class="x_x_MsoNormal"><span style=""> </span></p>
<p class="x_x_MsoNormal"><span style="">Best regards, </span></p>
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<p class="x_x_MsoNormal" style="line-height:105%; background:white"><b><span style="font-size:9.5pt; line-height:105%; font-family:"Verdana",sans-serif; color:#4F758B">Marita HILLENBRAND</span></b><span style="font-family:"Verdana",sans-serif; color:#4F758B"><br>
</span><span style="font-size:8.5pt; line-height:105%; font-family:"Verdana",sans-serif; color:#4F758B">Service Informatique</span><span style="font-family:"Verdana",sans-serif; color:#4F758B"></span></p>
<p class="x_x_MsoNormal" style="line-height:105%; background:white"><b><span style="font-size:7.5pt; line-height:105%; font-family:"Verdana",sans-serif; color:#4F758B">Centre Administratif et Technique</span></b><span style="font-size:7.5pt; line-height:105%; font-family:"Verdana",sans-serif; color:#4F758B"><br>
130, avenue Charles de Gaulle - 91230 Montgeron<br>
Tél : 01 70 58 93 40 Port : 06 24 04 43 58<br>
<a href="https://www.montgeron.fr/"><span style="color:#0563C1">www.montgeron.fr</span></a><br>
</span><span style="font-family:"Verdana",sans-serif; color:#4F758B"><br>
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<p class="x_x_MsoNormal"><b>De :</b> ZendTo <zendto-bounces@zend.to> <b>De la part de</b> arnaud Chevalier via ZendTo<br>
<b>Envoyé :</b> mercredi 6 juillet 2022 18:52<br>
<b>À :</b> zendto@zend.to<br>
<b>Cc :</b> arnaud Chevalier <arnaud_chevalier@hotmail.fr><br>
<b>Objet :</b> Re: [ZendTo] SMTP authentication on Exchange Online suddenly not working</p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">I did a mistake on the issue description: It's the IMAP authentication that not working anymore, you can see my configuration below:</span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black"> </span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black"><img border="0" width="866" height="451" id="x_x__x0000_i1025" style="width:9.0208in; height:4.6979in" data-outlook-trace="F:2|T:2" src="cid:image006.png@01D891EA.FF9884F0"></span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">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.</span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">On front side (try to log to the dashboard) I see a message telling me that the username or the password is not correct:</span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black"><img border="0" width="457" height="165" id="x_x__x0000_i1026" style="width:4.7604in; height:1.7187in" data-outlook-trace="F:2|T:2" src="cid:image007.png@01D891EA.FF9884F0"></span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black"> </span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">Thank you very much.</span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black"> </span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">Arnaud</span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black"> </span></p>
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<p class="x_x_MsoNormal"><b><span style="color:black">De :</span></b><span style="color:black"> ZendTo <<a href="mailto:zendto-bounces@zend.to">zendto-bounces@zend.to</a>> de la part de arnaud Chevalier via ZendTo <<a href="mailto:zendto@zend.to">zendto@zend.to</a>><br>
<b>Envoyé :</b> mercredi 6 juillet 2022 18:08<br>
<b>À :</b> <a href="mailto:zendto@zend.to">zendto@zend.to</a> <<a href="mailto:zendto@zend.to">zendto@zend.to</a>><br>
<b>Cc :</b> arnaud Chevalier <<a href="mailto:arnaud_chevalier@hotmail.fr">arnaud_chevalier@hotmail.fr</a>><br>
<b>Objet :</b> [ZendTo] SMTP authentication on Exchange Online suddenly not working</span>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">Dear all,</span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black"> </span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">I hope you are fine.</span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black"> </span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">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)</span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">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...</span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black"> </span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">MFA is not activated on the account.</span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">There have been no change on my ZendTo install or on the OS.</span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black"> </span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">Do you have an idea?</span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black"> </span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">Thank you very much.</span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black"> </span></p>
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<p class="x_x_MsoNormal"><span style="font-size:12.0pt; color:black">Arnaud</span></p>
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