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<p dir="auto">Hello all,</p>
<p dir="auto">I was hesitant to send this because I can't be the only person using MailMate for Exchange. But, maybe someone's seen the issue and can figure out what's going on.</p>
<p dir="auto">For about 2 weeks now, I have been able to send email via Outlook 365. IMAP is working perfectly fine for the same account.</p>
<p dir="auto">In the activity windows, I get</p>
<pre style="background-color:#F7F7F7; border-radius:5px 5px 5px 5px; margin-left:15px; margin-right:15px; max-width:90vw; overflow-x:auto; padding:5px" bgcolor="#F7F7F7"><code style="background-color:#F7F7F7; border-radius:3px; margin:0; padding:0" bgcolor="#F7F7F7">13:16:19 C: EHLO [192.150.23.129]
13:16:19 S: 250-YT1PR01CA0102.outlook.office365.com Hello [192.0.137.247]
13:16:19 S: 250-SIZE 157286400
13:16:19 S: 250-PIPELINING
13:16:19 S: 250-DSN
13:16:19 S: 250-ENHANCEDSTATUSCODES
13:16:19 S: 250-AUTH LOGIN XOAUTH2
13:16:19 S: 250-8BITMIME
13:16:19 S: 250-BINARYMIME
13:16:19 S: 250-CHUNKING
13:16:19 S: 250 SMTPUTF8
13:16:19 Retrieving password (keychain or user request)
13:16:19 C: AUTH XOAUTH2 ••••••••••
13:16:25 S: 535 5.7.3 Authentication unsuccessful [YT1PR01CA0102.CANPRD01.PROD.OUTLOOK.COM]
13:16:25 Error: Unexpected return code 535 (expected 235):
“5.7.3 Authentication unsuccessful [YT1PR01CA0102.CANPRD01.PROD.OUTLOOK.COM]”.
13:16:25 C: AUTH XOAUTH2 ••••••••••
13:16:31 S: 421 4.5.11 Too many authentication errors (4) on this connection, closing transmission channel. [YT1PR01CA0102.CANPRD01.PROD.OUTLOOK.COM]
13:16:31 Error: Unexpected return code 421 (expected 235):
“4.5.11 Too many authentication errors (4) on this connection, closing transmission channel. [YT1PR01CA0102.CANPRD01.PROD.OUTLOOK.COM]”.
13:16:31 C: AUTH XOAUTH2 ••••••••••
13:16:31 C: AUTH XOAUTH2 ••••••••••
</code></pre>
<p dir="auto"><strong>What I've tried</strong></p>
<ul>
<li>Deleting the oauth token (and refresh token) from my Keychain</li>
<li>Removing and re-adding the Exchange account</li>
<li>Changing my corporate password</li>
<li>Reinstalling MailMate</li>
</ul>
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