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SMTP Error: Could not connect to SMTP host.

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Hi there,

I know this topic has come up quite often and I’ve read many of them. Still figuring my case out.

So, my WP network is located on my server, and I am using ‘Other SMTP’ to send Mails via “united domains”. The login credentials are working when I enter them at the webmailer login interface from united domains, but they do not work with the plugin. 🙁

In another post I read that the location of web host und mail host is irrellevant, as long as I fill in the right info, so what’s the problem?

Here is the error code with nice tofu at the end – don’t know why.

Versions:
WordPress: 5.2.2
WordPress MS: Yes
PHP: 7.3.8
WP Mail SMTP: 1.5.2

Params:
Mailer: smtp
Constants: No
ErrorInfo: SMTP Error: Could not connect to SMTP host.
Host: smtp.udag.de
Port: 587
SMTPSecure: tls
SMTPAutoTLS: bool(true)
SMTPAuth: bool(true)

Server:
OpenSSL: OpenSSL 1.0.2g 1 Mar 2016
SMTP Debug:
2019-08-19 07:36:20 Connection: opening to smtp.udag.de:587, timeout=300, options=array (
)
2019-08-19 07:36:20 Connection: opened
2019-08-19 07:36:20 SERVER -> CLIENT: 220 smtp.udag.de ESMTP ready
2019-08-19 07:36:20 CLIENT -> SERVER: EHLO wordpress.te-webdesign.de
2019-08-19 07:36:20 SERVER -> CLIENT: 250-smtp.udag.de
250-SIZE 51200000
250-ETRN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-AUTH PLAIN LOGIN
250 STARTTLS
2019-08-19 07:36:20 CLIENT -> SERVER: STARTTLS
2019-08-19 07:36:20 SERVER -> CLIENT: 220 2.0.0 Start TLS
2019-08-19 07:36:20 SMTP Error: Could not connect to SMTP host.
2019-08-19 07:36:20 CLIENT -> SERVER: QUIT
2019-08-19 07:36:20 SERVER -> CLIENT: MIA�]$D.F��/) �A�v���vM��K�I<ã�s�y%�伐*ܬB��kܽ��(�@e?�+��#[�^l]��Y��忊�k2(�����ݧ�5��u;��]3X{“h�я������PP0*���~�wޥEGU&1 ��:*
��C��-�y��T���m`t��dې��U�+@kl�g^He
0c\ڔ]�{&��G�_��$���t�l��jM��ʀ��yE(����V n���Q�¥���J������Z”-zQQHw NW/�eEC�D�$qE�p�h!��ڠ�O��(��dy��o�l�8tS��”�㭮Ø
2019-08-19 07:36:20 SMTP ERROR: QUIT command failed: MIA�]$D.F��/) �A�v���vM��K�I<ã�s�y%�伐*ܬB��kܽ��(�@e?�+��#[�^l]��Y��忊�k2(�����ݧ�5��u;��]3X{“h�я������PP0*���~�wޥEGU&1 ��:*
��C��-�y��T���m`t��dې��U�+@kl�g^He
0c\ڔ]�{&��G�_��$���t�l��jM��ʀ��yE(����V n���Q�¥���J������Z”-zQQHw NW/�eEC�D�$qE�p�h!��ڠ�O��(��dy��o�l�8tS��”�㭮Ø
2019-08-19 07:36:20 Connection: closed
2019-08-19 07:36:20 SMTP Error: Could not connect to SMTP host.

(Again, yes, the tofu is what I am getting in the error log)

Thank you so much in advance


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