Graylog can't send e-mails since we have a new mailserver

The error message is as follows:
"### An error occurred while trying to send an email! (triggered a few seconds ago)

The Graylog server encountered an error while trying to send an email. This is the detailed error message: org.apache.commons.mail.EmailException: Sending the email to the following server failed : (javax.mail.MessagingException: Could not convert socket to TLS; nested exception is: PKIX path building failed: unable to find valid certification path to requested target)"

Any ideas on how I might solve this?

I checked it, and your new server uses self signed certificate, which graylog don’t like:
openssl s_client -starttls smtp -showcerts -connect -servername

Anyway, your SMTP server uses a lot of old protocols like RC4, SSL3 and so on:
nmap -Pn --script ssl-enum-ciphers -p 587

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