Cannot connect to smtp mail server
5193
What causes the 'Connection Refused' message?
45169
SSH connection problem with "Host key verification failed..." error
44692
Sendmail: DSN: Service unavailable
44277
How to validate smtp credentials before sending mail?
90053
How do I specify SMTP server for an e-mail in PHP?
107112
No connection could be made because the target machine actively refused it (PHP / WAMP)
143333
Can't connect to MySQL server on 'localhost' (10061)
98383
Can not access server using Port forwarding
125639
client denied by server configuration
119008
Failed to connect to mailserver at "localhost" port 25
96229
'Failed to login: Invalid ip' when connecting to servers
141375
SMTP-AUTH required for local domains?
73681
The search service is not able to connect to the machine that hosts the administration component
95733
Unrecognized SSL message, plaintext connection? Exception
129769
SMTP 25 closed even though I allow everything in firewall (Debian server running sendmail)
109608
The SMTP server requires a secure connection or the client was not authenticated.
18894
PHP : send mail in localhost