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If you are still using CentOS 7.9, it's time to convert to Alma 8 with the free centos2alma tool by Plesk or Plesk Migrator. Please let us know your experiences or concerns in this thread:
CentOS2Alma discussion
Issue Cannot connect to SMTP server (Outgoing Mail)
- Thread starter Pampero
- Start date
-
- Tags
- cannot connect smtp
This question does not seem to be related to a Plesk server installation. But if it does: Check in Tools/Settings>Services that the mail services are running.
Connect error 421 / 10060 refers to a general issue of your computer to connect to the SMTP port of the outgoing mail server. Please first check, whether you can connect to port 25, 465 or 587 at all. You can use these instructions for the check: http://cheap-webserver-us.bitpalast.net?q=x&h=#13 . If Telnet client is not installed, here is how to activate it: http://cheap-webserver-us.bitpalast.net?q=x&h=#52 . Check your local firewall settings, check your antivirus software (it may block SMTP ports). Also check your Internet router, because some include a list of "safe" outgoing mail servers that you might to need to add yours to.
Connect error 421 / 10060 refers to a general issue of your computer to connect to the SMTP port of the outgoing mail server. Please first check, whether you can connect to port 25, 465 or 587 at all. You can use these instructions for the check: http://cheap-webserver-us.bitpalast.net?q=x&h=#13 . If Telnet client is not installed, here is how to activate it: http://cheap-webserver-us.bitpalast.net?q=x&h=#52 . Check your local firewall settings, check your antivirus software (it may block SMTP ports). Also check your Internet router, because some include a list of "safe" outgoing mail servers that you might to need to add yours to.
Pampero
New Pleskian
Thanks for your reply Peter.
Illegal character(s) in hostname -- replacing with '*' i dont have illegal character in host name do you think problem is from this?
Host is up (0.15s latency).
Not shown: 546 closed ports
PORT STATE SERVICE
25/tcp open smtp
53/tcp open domain
80/tcp open http
106/tcp open pop3pw
110/tcp open pop3
111/tcp filtered rpcbind
135/tcp filtered msrpc
136/tcp filtered profile
137/tcp filtered netbios-ns
138/tcp filtered netbios-dgm
139/tcp filtered netbios-ssn
143/tcp open imap
443/tcp open https
445/tcp filtered microsoft-ds
465/tcp open smtps
513/tcp filtered login
520/tcp filtered unknown
Illegal character(s) in hostname -- replacing with '*' i dont have illegal character in host name do you think problem is from this?
Host is up (0.15s latency).
Not shown: 546 closed ports
PORT STATE SERVICE
25/tcp open smtp
53/tcp open domain
80/tcp open http
106/tcp open pop3pw
110/tcp open pop3
111/tcp filtered rpcbind
135/tcp filtered msrpc
136/tcp filtered profile
137/tcp filtered netbios-ns
138/tcp filtered netbios-dgm
139/tcp filtered netbios-ssn
143/tcp open imap
443/tcp open https
445/tcp filtered microsoft-ds
465/tcp open smtps
513/tcp filtered login
520/tcp filtered unknown
Your port list look as if this was generated on your target server. But that is normally not the cause of issues of the 421/10060 error. Did you do the telnet test from your client to rule out that a firewall, antivirus or router security setting might be blocking porte 25, 465, 587? What program exactly gives you the error message described in your first post?
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