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Can only receive first test email, then no more sending

I've discovered mails weren't sent properly to almost any account except our own domain. I've been experimenting with changing the outgoing SMTP server. I've setup an email account in my DirectAdmin panel, tested through roundcube, sending to hotmail and other domain is OK. But in coreBOS, I can only get the first test email working. After that, if I try to send a test e-mail I, the first time the 'send to' email get shortened to only the name. I reselect the account or contact and try again. Then I get a 500 error. I've setup the SMTP server using the 'tls://' prefix and using port 587. I've setup the PHPMailer debugging, the ultimate error is this:

SMTP ERROR: Password command failed: 535 Incorrect authentication data
SMTP Error: Could not authenticate.CLIENT -> SERVER: QUIT

But, as said, the first test email works (the automated one).

Seem to have found this out. I could only use the main DirectAdmin user. Any sub-users were declined. By the way: excellent tips on how to setup the mailserver Setup outgoing mailserver coreBOS docs.

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Can only receive first test email, then no more sending - Guido1982 - 11-28-2016, 02:51 PM

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