Closed Cannot sent user mail.client-domain.tld

i test my smtp using wp mail smtp pro
php8.0

when i put server host: mail.client-domain.tld
result error

but when i change the host to mail.my-hostname.tld
everything is working

how to fix it ?

@die2mrw007 @shoaibkk @S4_Hosting and other ?
anyone ?

I have noticed same issue on when connecting mail box to gmail. Other one what give complain of mail server is outlook if don’t use main mail server domain.

so, is this an issue/bug ? or just miss configuration ?

what do you think ?

i hope this is my mistake…
if not…then developer will have +1 homework

I think it’s something to do with some mail systems want actual sending mail server mach.

some past version (i forgot what month)
it’s working…
i can use mail.client-domain.tld
but few days ago it came to failure

I just checked I use same plugin free version on one site with own maiserver, that’s working fine even use not main mail server host

so… at your side, it’s working
i tried free version too, same result… error
omg… is this my local problems ?

When you send test mail what full error report say?

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Versions:
WordPress: 6.0
WordPress MS: No
PHP: 8.0.20
WP Mail SMTP: 3.4.0

Params:
Mailer: smtp
Constants: No
ErrorInfo: SMTP Error: Could not connect to SMTP host.
Host: mail.xxxxxxx.org
Port: 465
SMTPSecure: ssl
SMTPAutoTLS: bool(true)
SMTPAuth: bool(true)

Server:
OpenSSL: OpenSSL 1.1.1f 31 Mar 2020
Apache.mod_security: No

Debug:
Email Source: WP Mail SMTP Pro
Mailer: Other SMTP
SMTP Error: Could not connect to SMTP host.

SMTP Debug:
2022-06-13 09:05:08 Connection: opening to ssl://mail.xxxxxxx.org:465, timeout=300, options=array()

2022-06-13 09:05:08 Connection failed. Error #2: stream_socket_client(): SSL operation failed with code 1. OpenSSL Error messages:error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed [/home/xxxxx.org/public_html/wp-includes/PHPMailer/SMTP.php line 389]

2022-06-13 09:05:08 Connection failed. Error #2: stream_socket_client(): Failed to enable crypto [/home/xxxxx.org/public_html/wp-includes/PHPMailer/SMTP.php line 389]

2022-06-13 09:05:08 Connection failed. Error #2: stream_socket_client(): Unable to connect to ssl://mail.xxxxxx.org:465 (Unknown error) [/home/xxxxx.org/public_html/wp-includes/PHPMailer/SMTP.php line 389]

2022-06-13 09:05:08 SMTP ERROR: Failed to connect to server: (0)

SMTP Error: Could not connect to SMTP host.

i just change to mail.primary-domain.tld then everything is working fine
mail.primary-domain.tld at cloudflare too

You already tried re-issue SSL for this mail domain?

already did…
thats why i post here
i affraid bug ssl is comming back

Need to check if you issue mail server SSL for any domain

i will try re issue other domain…

only happen to new added domain(new-issued)

forget it… i will let it use primary domain.

my head already smoked out

i hope it will solved in next 3 month hahaha