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How to change SMTP port for Android

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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