SMTP Relay IO::Socket::INET6: connect: timeout

%3CLINGO-SUB%20id%3D%22lingo-sub-1039507%22%20slang%3D%22de-DE%22%3ESMTP%20Relay%20IO%3A%3ASocket%3A%3AINET6%3A%20connect%3A%20timeout%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-1039507%22%20slang%3D%22de-DE%22%3E%3CP%3EHello%3C%2FP%3E%3CP%3EWe%20are%20developers%20of%20monitoring%20systems%20and%20via%20a%20web%20portal%20(Linux%2Fubuntu%2Fapache)%20what%20works%20with%20a%20phpmailer%20the%20alarm%20mails%20are%20sent.%3C%2FP%3E%3CP%3ESMTP%20Relay%20set%20up%2C%20Connector%20set%20up%2C%20SPF%20entries%20entered%20with%20IP%20address%2C%20RCA%20test%20runs%20without%20any%20problems.%3C%2FP%3E%3CP%3EThe%20first%20three%20mails%20go%20out%20in%20a%20row%20without%20any%20problems%2C%20from%20the%20fourth%20mail%20the%20following%20error%20message%3A%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3E%3D%3D%3D%20Trying%20domain-at.mail.protection.outlook.com%3A25...%3C%2FP%3E%3CP%3EError%20connecting%20to%20domain-at.mail.protection.outlook.com%3A25%3A%3C%2FP%3E%3CP%3EIO%3A%3ASocket%3A%3AINET6%3A%20connect%3A%20timeout%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EAsk%20for%20help%2C%20our%20know-how%20is%20at%20the%20end.%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EMFG%20Thomas%20M.%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-1039507%22%20slang%3D%22de-DE%22%3E%3CLINGO-LABEL%3EOffice%20365%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E
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Frequent Visitor

Hallo,

Wir sind Entwickler von Monitoringsystemen und über ein Webportal (Linux/ubuntu/apache) was mit einem phpmailer arbeitet werden die Alarmmails versendet.

SMTP Relay eingerichtet, Connector eingerichtet, SPF Einträge mit IP-Adresse eingetragen, RCA Test läuft ohne Probleme.

Die ersten drei Mails gehen hintereinander ohne Probleme raus, ab dem vierten Mail dann folgende Fehlermeldung:

 

=== Trying domain-at.mail.protection.outlook.com:25...

*** Error connecting to domain-at.mail.protection.outlook.com:25:

***     IO::Socket::INET6: connect: timeout

 

Bitte um Hilfe, unser Know-how ist am Ende.

 

MFG Thomas M.

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