jlt1 via tde-devels wrote:
smtp.mail.com
could be anything. better try manually could be you have wrong protocol/TLS or whatever. Try following and if it does not help look at the communication
https://www.thomas-krenn.com/en/wiki/Test_TCP_Port_25_(smtp)_access_with_tel...
SMTP is a plain text protocol.[1][2] This makes it easy to simulate a mail client with the telnet command to check the access to port 25.
The following steps are required on a Linux command line:
Execute telnet SERVERNAME 25. This connects telnet to port 25 on the server with the name SERVERNAME. The name or IP address of the server for a domain can be determined by dig DOMAIN -t MX. If there is no own MX record for a domain, the corresponding A-record must be used. If the TCP connection can be established, telnet responds with the message Connected to SERVERNAME. and Escape character is' ^]'. . Now you can send an e-mail via SMTP protocol. The best way to do this is to use a recipient address for which the connected mail server is responsible. EHLO test.example.com MAIL FROM:<SENDERADDRESS> RCPT TO:<RECIPIENTADDRESS> DATA Subject: Testmessage (Blank line, press Enter again) This is a test. (Blank line, press Enter again) . QUIT
In the following example, an e-mail is sent to an e-mail address. In the example below, the domain example.com is used for documentation, please replace it with your mail server:[3]
[user@fedora9 user]$ telnet mail.example.com 25 Trying 192.0.2.10... Connected to mail.example.com. Escape character is '^]'. 220 mail.example.com ESMTP Postfix (Debian/GNU) EHLO test.example.com 250-mail.example.com 250-PIPELINING 250-SIZE 30720000 250-VRFY 250-ETRN 250-STARTTLS 250-AUTH LOGIN DIGEST-MD5 PLAIN CRAM-MD5 250-AUTH=LOGIN DIGEST-MD5 PLAIN CRAM-MD5 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN MAIL FROM:test@example.com 250 2.1.0 Ok RCPT TO:user@example.com 250 2.1.5 Ok DATA 354 End data with <CR><LF>.<CR><LF> Subject: Testmessage
This is a test.
. 250 2.0.0 Ok: queued as 83398728027 QUIT 221 2.0.0 Bye Connection closed by foreign host. [user@fedora9 user]$