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Why TCP port 25 (SMTP) is blocked for outgoing connections?

April 26, 2017blocked outgoing port SMTP TCP

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Why TCP port 25 (SMTP) is blocked for outgoing connections?

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We block this port to prevent spamming activity. Sometimes the user does not know he has malicious programs on his computer that send spam through the network. As the result, that IP address appears in black lists. To prevent this we blocked TCP port 25 on our service. There are three ways to overcome this: You may use our SMTP server to send mails. You may request to unblock certain servers for your account. This is free of charge. Take into consideration, that labour charge may be applied in case of abuse or blacklisting. You may request to unblock SMTP port completely. Contact us if you really need it. We will request a deposit to cover possible charges in case of abuse.