How to fix your mail host refusing to send email from your address

Email started as a way to send a file between early internetworked computers with little checking about who was sending what. Despite the 60-odd years that have passed, that’s more or less what happens between modern mail servers when you send and receive messages. Email is, at its heart, a text file that is transmitted by your email app telling a mail server in plain text who the message is from and to whom it’s going. The recipient has

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