My welcome e-mail is being sent twice, I don’t understand why. All the others (confirmation, etc) are sent only once, and work fine. After you have received the first welcome e-mail, another exact copy arrives between 10 to 15 minutes later.
It can be due to antivirus following the confirmation link one or more time. I’m working on a different method just to try to block that bot without creating problem to subscribers which should be able to click twice or more on a confirmation link if something goes wrong.