Check your firewall if smtp/smtps ports have rules to allow connection. I have checked you do not have dns failures however, its recommended to setup a rDNS ptr record. This record is essntial for reverse dns lookups that help troubleshooting email delivery issues, antispam filtering, better logging for recipient mail servers to identify email delivery issues
when using port 465 force tls got this :
SMTP → ERROR: EHLO not accepted from server:
SMTP → ERROR: HELO not accepted from server:
SMTP → NOTICE: EOF caught while checking if connected
and when I try using port 587 TLS it keeps loading nothing changes, but I got this on postfix activity :
Feb 17 14:51:15 mail.ayyoubaissaoui.com postfix/submission/smtpd[146396]: SSL_accept error from ns101305.ip-147-135-6.us[147.135.6.154]: -1
Feb 17 14:51:15 mail.ayyoubaissaoui.com postfix/submission/smtpd[146396]: warning: TLS library problem: error:14094415:SSL routines:ssl3_read_bytes:sslv3 alert certificate expired:…/ssl/record/rec_layer_s3.c:1543:SSL alert number 45:
Feb 17 14:51:15 mail.ayyoubaissaoui.com postfix/submission/smtpd[146396]: lost connection after STARTTLS from ns101305.ip-147-135-6.us[147.135.6.154]
Feb 17 14:51:15 mail.ayyoubaissaoui.com postfix/submission/smtpd[146396]: disconnect from ns101305.ip-147-135-6.us[147.135.6.154] ehlo=1 starttls=0/1 commands=1 /2
Feb 17 14:51:16 mail.ayyoubaissaoui.com postfix/submission/smtpd[146396]: connect from ns101305.ip-147-135-6.us[147.135.6.154]
Feb 17 14:51:16 mail.ayyoubaissaoui.com postfix/submission/smtpd[146396]: SSL_accept error from ns101305.ip-147-135-6.us[147.135.6.154]: -1
Feb 17 14:51:16 mail.ayyoubaissaoui.com postfix/submission/smtpd[146396]: warning: TLS library problem: error:14094415:SSL routines:ssl3_read_bytes:sslv3 alert certificate expired:…/ssl/record/rec_layer_s3.c:1543:SSL alert number 45:
Feb 17 14:51:16 mail.ayyoubaissaoui.com postfix/submission/smtpd[146396]: lost connection after STARTTLS from ns101305.ip-147-135-6.us[147.135.6.154]
Feb 17 14:51:16 mail.ayyoubaissaoui.com postfix/submission/smtpd[146396]: disconnect from ns101305.ip-147-135-6.us[147.135.6.154] ehlo=1 starttls=0/1 commands=1
Well protocol is wrong word its just a command to use either TLS or SSL. The upside of using it is server can establish plain-text transmission of an email if an ecrypted transport fails.
Normally for SMTP we use port 587 which allows explicit encryption method
