I'm trying to configure my Gmail account so that I can use it to send mail as my Microsoft address (let's say it's example@hotmail.com), but I'm getting a weird error.I've already gone into Gmail's Settings > Accounts and Import and added the Hotmail address under the Send mail as section, using server smtp.live.com, on port 587 with TLS. Gmail is now asking me to verify that I own the Hotmail address via an e-mailed code.Unfortunately, every automatic verification mail that Gmail sends to example@hotmail.com results in this:Delivery to the following recipient failed permanently:    example@hotmail.comTechnical details of permanent failure:  Google tried to deliver your message, but it was rejected by the server for the recipient domain hotmail.com by mx4.hotmail.com. [65.55.92.184].The error that the other server returned was:  550 Requested action not taken: mailbox unavailable----- Message suppressed -----The exact Hotmail server varies but the message is otherwise the same.Some quick searching shows that a 550 error usually results when an e-mail address is entirely invalid, as would happen if the account didn't exist. However, I can log into Hotmail as example@hotmail.com and when I manually type up an e-mail in Gmail and send it to example@hotmail.com, it goes through just fine.What can I do to finish setting up this mail alias?
550 error when trying to set up Gmail to send mail as Hotmail
gmail;email;outlook.com
Well, I don't know why Gmail wants to send a test message to anyone, the only thing I had to do to prove myself the owner of the account was to provide the correct password. If you followed http://windows.microsoft.com/en-us/windows/outlook/send-receive-from-app, and set up the smpt as smtp-mail.outlook.com, and can send mails using the From selector, I wouldn't worry about the failed test.