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A lot of my contacts have gmx email, and they are complaining that are not receving email sent directly from SF. Does Salesforce has any compability problem with GMX?

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    Have you taken any steps to debug this issue?
    – Adrian Larson
    Commented Apr 14, 2014 at 17:31

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Yes, they have. We opened a ticket with Salesforce and asked GMX. Here is the reply from GMX (translated): The email servers from Salesforce are trying to establish a a secure connection with outdated encryption techniques, which of course fails. Salesforce is aware of this problem.

The answer from Salesforce support is, that their R&D team is working on it.

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  • as of today the problem is partially solved. I used the Salesforce "Test Deliverability" (Setup -> Email Administration -> Test Deliverability) with a GMX address. Out of the 52 test emails sent from 52 different Salesforce servers, 36 was received by the GMX account. According to our support the Salesforce R&D are still working on it. We hope they will fix the remaining servers until Saturday.
    – Mike
    Commented Apr 17, 2014 at 15:57

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