Portal Home > Knowledgebase > Windows Hosting > Email > My ISP blocks SMTP port 25, is there an alternate smtp port?
If you are with an ISP such as AOL or Orange, you may find they block the standard SMTP port (25), therefore you cannot access our SMTP server.
We offer an alternative SMTP port number 543 that can be used with these ISP's. Most mail clients let you change this port number from the same screen that you setup your mail account.
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