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How to change SMTP port for Android
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Some Cell Phone email providers and Internet service providers (ISPs)
block port 25 to reduce the amount of junk mail that originates from
their domains. By blocking port 25, an ISP requires customers to use
its SMTP servers so it can monitor outgoing messages and reduce spam.
If your Cell Phone provider or ISP is blocking port 25 but not port
587, change the port to 587 and try again.
Choose Mail >
Preferences, click Accounts, select your website email account, and
then click Account Information.
Choose Edit Server List from the
Outgoing Mail Server (SMTP) pop-up menu, click Advanced, replace 25
with 587 in the Server port field, and then click OK. Try sending
your message again.
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