Error with Office 365

Mailer: postsmtp
HostName: dtmd.eu
cURL Version: 7.45.0
OpenSSL Version: OpenSSL/1.0.2n
OS: Linux bitnami-wordpress-abf8 4.15.0-1049-azure #54-Ubuntu SMP Mon Jun 24 20:59:24 UTC 2019 x86_64
PHP: Linux 7.0.27 C
PHP Dependencies: iconv=Yes, spl_autoload=Yes, openssl=Yes, sockets=Yes, allow_url_fopen=Yes, mcrypt=Yes, zlib_encode=Yes
WordPress: 5.2.2 de_DE UTF-8
WordPress Theme: Allegiant Pro Child – DTMD
WordPress Plugins: Polylang, Gravity Forms, All-in-One WP Migration, Cookie Notice, CPO Companion, CPO Content Types, CPO Shortcodes, CPO Widgets, Disable Comments, Easy Table of Contents, Enable Media Replace, Gravity Forms Dynamics CRM Add-On, Modula, Modula PRO, Post SMTP, Page Builder by SiteOrigin, SiteOrigin Widgets Bundle, TC Team Members Pro, Use Google Libraries
WordPress wp_mail Owner: /opt/bitnami/apps/wordpress/htdocs/wp-content/plugins/post-smtp/Postman/PostmanWpMailBinder.php
WordPress wp_mail Filter(s): wp_staticize_emoji_for_email
Postman: 2.0.4
Postman Sender Domain (Envelope|Message): dtmd.eu | dtmd.eu
Postman Prevent Message Sender Override (Email|Name): Yes | Yes
Postman Active Transport: SMTP (smtp:tls:login://smtp.office365.com:587)
Postman Active Transport Status (Ready|Connected): Yes | Yes
Postman Deliveries (Success|Fail): 255 | 491
Postman Email Log (Enabled|Limit|Transcript Size): Yes | 500 | 128

Not that I know about, maybe change some settings in Exchange, but I allready check them and can’t find an error.
Same webhost, also I deactivate all Plugins to check if there is any problem.

it’s very strange to me…

no, expiration is disabled for the moment.

still not working, just double check again everthing

did it 🙂