Email port 587: Difference between revisions
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Port 587 is a special TCP port reserved for authenticated submission of email messages. Authentication can be done over the standard port 25, but 587 has the advantage that it is seldom blocked by networks providing Internet access to travelers. The standard email port 25 is frequently blocked due to widespread abuse. That abuse cannot occur with port 587, because servers on this port require authentication. | Port 587 is a special TCP port reserved for authenticated submission of email messages. Authentication can be done over the standard port 25, but 587 has the advantage that it is seldom blocked by networks providing Internet access to travelers. The standard email port 25 is frequently blocked due to widespread abuse. That abuse cannot occur with port 587, because servers on this port require authentication. | ||
Revision as of 10:33, 29 August 2009
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Port 587 is a special TCP port reserved for authenticated submission of email messages. Authentication can be done over the standard port 25, but 587 has the advantage that it is seldom blocked by networks providing Internet access to travelers. The standard email port 25 is frequently blocked due to widespread abuse. That abuse cannot occur with port 587, because servers on this port require authentication.