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Knowledge Base: General Questions 6. I have a problem sending mail, what could be wrong? - Top One of three problems could be occuring. 3) If you get a straight cannot connect error most likely your ISP blocks port 25. This means you must use their SMTP server. You can contact them for verification. 2) If you are receiving a relay error make sure your email client is set for "SMTP server requirress authenticatication" 3) Your IP must be broadcasted on the internet. If your ISP does not assign real IP numbers to your dialup, DSL, or cable modem you will need to contact support to have a special entry made for your ISP in the sendmail host file. - Updated: November 13, 2002