Other email programs will have similar settings. Highlight the account in question and select CHANGE.Recently ATT and Verizon both made changes that affected outgoing mail. In these cases you are connecting to the internet through your ISP (like Comcast, SpeakEasy, ATT, etc) and trying to send email through your third party host like ISP says “Hey! There is someone on my network trying to send email through someone elses address! This might be spam or malware!” You can receive mail, but you can’t send mail. Most people having a setup where they are on an Internet Service Provider (ISP) like ATT and have an email address like You connect to the internet using ATT and send mail through the ATT server – no problem.īut if you have your own domain email address or an email address from another ISP you may hit a snag. Hang on – it will make sense in a second: As a result, many ISPs are restricting its use. ![]() But port 25 is widely abused by malware to spread worms and spam. ![]() Almost all mail client program send e-mail using port 25, which is also the port used by mail servers to talk to each other.
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