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How do I get port 25 unblocked for mediacom

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Mediacom said I would have to have you unblock port 25 so I can send email out

Mediacom said I would have to have you unblock port 25 so I can send email out

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What is your problem in the first place?

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Mediacom say's thunderbird has blocked port 25 and they have to unblock it

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This is rubbish. Thunderbird does not block any port. You'll need to provide more details about your problem.

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Do you maybe use a firewall program that blocks that port?

Also, is it this company, Mediacom Cable: https://mediacomcable.com/site/about.html

If so, their help page doesn't mention using port 25 at all: https://support.mediacomcable.com/content/what-are-pop3-and-imap-mail-server-settings-mediacom