I know that I can sign up to a service using user+foo@example.com, the question I have is how can I send an email from this same address?


Yes. Add it the same way you'd add any other email to send from:

  1. Click on Settings in the upper right.
  2. Click on Accounts and Import.
  3. In the "Send mail as" section click "Add another email address you own".
  4. Add the "plus email" and finish the setup.
  5. Compose an email and select the custom "plus email" in the From dropdown.
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    For reference, here's Google's page explaining how to add a custom from address: mail.google.com/support/bin/answer.py?answer=22370 – Senseful Sep 16 '10 at 20:26
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    Would you recommend checking the "Treat as alias" checkbox? The provided help article support.google.com/a/answer/1710338 is not easy to understand in this context. – qbolec Dec 9 '15 at 15:50
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    That thing is pretty hard to understand, agreed -- but I think in almost every case of someone using a "plus address" it would be desirable to "Treat as an alias", so I would say leave it checked. The only time to not use that, from my interpretation, is if you are sending mail as someone else (as an assistant, or helicopter parent perhaps?) and you really want to be able to see it as a distinct usage scenario. – Code Jockey Feb 5 '16 at 15:09

It is officially not supported but there is a workaround using the "send mail as"-feature:

You need to go to the Settings tab and click Accounts and Import. Click there Sent mail from another address and enter your plus e-mail address. Click Next Step and the plus mail address is ready for use. You need to do this for every address you want to use.

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    So you have to do this for every +address you want to use? – Senseful Jul 14 '10 at 15:23
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    It doesn't send verification for "plus" emails. – Rebecca Chernoff Jul 14 '10 at 15:24
  • @Senseful Yes. It is a much requested feature from Google but its not implemented yet. – neo Jul 14 '10 at 15:24
  • Regarding your edit: Are you sure? I went through the steps as I was typing up my answer and I received the email and it has the +address as the sent-from address. – Rebecca Chernoff Jul 14 '10 at 15:27
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    Ok, I found my mistake. I use GMail in Germany and because of trademark issues it is not allowed for them to use the term GMail for their service, instead it is named Google Mail over here. Nonetheless receiving mails via {name}@gmail.com is still possible. Sending somehow not anymore. Using {name}+plus@googlemail.com actually worked. – neo Jul 14 '10 at 15:42

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