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The SMTP protocol itself it fairly simple: You start with HELO or EHLO, state the sender address with the MAIL TO command, specify the recipient with the RCPT TO command, and finally send the mail itself with the DATA command.
Most SMTP servers will refuse mail from blacklisted IP addresses, which usually include all IP ranges used by ISPs for dynamic address assignment. Some servers will accept the connection but reject the mail, while others refuse the TCP connection altogether. Also, your mails may be rejected by a number of anti-spam measures.
ISP mail relays are increasingly using the mail submission port (587) rather than port 25, usually in combination with StartTLS and forced authentication.
The SMTP protocol itself it fairly simple: You start with HELO or EHLO, state the sender address with the MAIL TO command, specify the recipient with the RCPT TO command, and finally send the mail itself with the DATA command.
Most SMTP servers will refuse mail from blacklisted IP addresses, which usually include all IP ranges used by ISPs for dynamic address assignment. Some servers will accept the connection but reject the mail, while others refuse the TCP connection altogether. Also, your mails may be rejected by a number of anti-spam measures.
ISP mail relays are increasingly using the mail submission port (587) rather than port 25, usually in combination with StartTLS and forced authentication.
so how i can become whitelist ip address. what is the other ways to send mail in this way if am blacklisted.
so how i can become whitelist ip address. what is the other ways to send mail in this way if am blacklisted.
If you're running a mail server and have been assigned a fixed, public IP address, and the host name is registered as a mail exchanger for the domain of the sender, you should be able to send mail anywhere. Ideally, you should also create Sender Policy Framework records in DNS.
However, if you're a regular broadband customer with a dynamic IP address, that address cannot be whitelisted, as blacklist providers such as SpamCop and Spamhaus just don't allow it. This is a Good Thing, as it helps prevent spam.
You will most likely have to use the relay server provided by the ISP. As I mentioned, this server may use the Mail Submission port rather than the standard SMTP port, and may require authentication and StartTLS, the latter of which rules out using a telnet client to send e-mails.
Hi Mr.Cracker,
Check the smtp port number and check the service is running or not then try to telnet using that port number.
The port is obviously correct, since they were able to connect to it WITH telnet. Did you not read any of the previous posts???
Ser Olmy answered the question in post #6. OP, you're going to have to work with your ISP, unless you're running your own mail server in accordance with the guidelines of your provider.
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