[ZendTo] IMAP authentication on Exchange Online suddenly not working

Fri Jul 8 09:06:51 BST 2022

Dear All,

If anyone have the same issue with IMAP authentication with Exchange Online, please find below how I temporarily solved it :

I reactivated the IMAP basic authentication by following this official process : https://techcommunity.microsoft.com/t5/exchange-team-blog/basic-authentication-and-exchange-online-june-2021-update/ba-p/2454827
[https://techcommunity.microsoft.com/t5/image/serverpage/image-id/289315i6DBE257934C0D79C?v=v2]<https://techcommunity.microsoft.com/t5/exchange-team-blog/basic-authentication-and-exchange-online-june-2021-update/ba-p/2454827>
Basic Authentication and Exchange Online – June 2021 Update<https://techcommunity.microsoft.com/t5/exchange-team-blog/basic-authentication-and-exchange-online-june-2021-update/ba-p/2454827>
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 ...
techcommunity.microsoft.com
Like that, I have until 1st of october to properly migrate my ZendTo authentication to AD or SAML.

Kind regards,

Arnaud

________________________________
De : ZendTo <zendto-bounces at zend.to> de la part de arnaud Chevalier via ZendTo <zendto at zend.to>
Envoyé : jeudi 7 juillet 2022 10:52
À : HILLENBRAND Marita <m.hillenbrand at montgeron.fr>
Cc : arnaud Chevalier <arnaud_chevalier at hotmail.fr>; ZendTo Users <zendto at zend.to>
Objet : Re: [ZendTo] SMTP authentication on Exchange Online suddenly not working

Hello Marita,

Thank you for your answer.
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).

[cid:2a37c8d5-19e9-4fb3-86ee-d52b8bd3044b]

I will try configure SAML, did you used this tutorial ? => https://zend.to/azure
SAML works also fine if users have MFA enable?

Kind regards,

Arnaud
________________________________
De : HILLENBRAND Marita <m.hillenbrand at montgeron.fr>
Envoyé : jeudi 7 juillet 2022 10:19
À : arnaud Chevalier <arnaud_chevalier at hotmail.fr>
Cc : ZendTo Users <zendto at zend.to>
Objet : RE: SMTP authentication on Exchange Online suddenly not working

Hello,

Your problem might be due to Microsofts new security policy : They’re progressively turning off Basic Authentication protocols, wich includes IMAP, see joined message.

Luckily, SMTP will be still available.

We’re using SAML authentication for our Office 365, it still works.

Best regards,

Marita HILLENBRAND
Service Informatique

Centre Administratif et Technique
130, avenue Charles de Gaulle - 91230 Montgeron
Tél : 01 70 58 93 40  Port : 06 24 04 43 58
www.montgeron.fr<https://www.montgeron.fr/>

[cid:image001.jpg at 01D84DAF.08804830]

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De : ZendTo <zendto-bounces at zend.to> De la part de arnaud Chevalier via ZendTo
Envoyé : mercredi 6 juillet 2022 18:52
À : zendto at zend.to
Cc : arnaud Chevalier <arnaud_chevalier at hotmail.fr>
Objet : Re: [ZendTo] SMTP authentication on Exchange Online suddenly not working

I did  a mistake on the issue description: It's the IMAP authentication that not working anymore, you can see my configuration below:

[cid:image006.png at 01D891EA.FF9884F0]

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.

On front side (try to log to the dashboard) I see a message telling me that the username or the password is not correct:

[cid:image007.png at 01D891EA.FF9884F0]

Thank you very much.

Arnaud

________________________________

De : ZendTo <zendto-bounces at zend.to<mailto:zendto-bounces at zend.to>> de la part de arnaud Chevalier via ZendTo <zendto at zend.to<mailto:zendto at zend.to>>
Envoyé : mercredi 6 juillet 2022 18:08
À : zendto at zend.to<mailto:zendto at zend.to> <zendto at zend.to<mailto:zendto at zend.to>>
Cc : arnaud Chevalier <arnaud_chevalier at hotmail.fr<mailto:arnaud_chevalier at hotmail.fr>>
Objet : [ZendTo] SMTP authentication on Exchange Online suddenly not working

Dear all,

I hope you are fine.

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)

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...

MFA is not activated on the account.

There have been no change on my ZendTo install or on the OS.

Do you have an idea?

Thank you very much.

Arnaud

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