If you are using Google's SMTP servers, then it validates the From: header and restricts it to those which you have registered against that account.
You can register additional addresses (including non-Google ones): Settings > See all settings > Accounts and Import > Send Mail As (Use Gmail to send from your other email addresses) > Add another email address It will send a verification mail so that you can prove you own that E-mail address. On Thursday, 9 September 2021 at 22:03:32 UTC+1 dean.w....@gmail.com wrote: > It could be that I'm not using smtp.SendMail() correctly, which is why I > posted it here. Thanks for your guess, though. > > On Thursday, September 9, 2021 at 2:31:11 PM UTC-6 rol...@gmail.com wrote: > >> Hello, >> >> Am Do., 9. Sept. 2021 um 20:19 Uhr schrieb Dean Schulze < >> dean.w....@gmail.com>: >> >>> I'm sending emails with smtp.SendMail() via gmail. I set the from >>> argument to smtp.SendMail() to a different email address than my gmail >>> username, but the emails still get sent with the From: as my gmail address. >>> >>> Do I need to do something else to change the From: in the emails, or is >>> gmail always going to use my gmail address? >>> >>> I guess gmail uses the address bound to the used account, which would be >> in my opinion quite reasonable behavior. >> >> BTW this question is a bit OT here since not related to Go rather than >> mailing policy of Google accounts. >> >> BR, >> Roland >> >> Thanks. >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "golang-nuts" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to golang-nuts...@googlegroups.com. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/golang-nuts/04eb41bd-9002-443b-8921-c3ddcd833c87n%40googlegroups.com >>> >>> <https://groups.google.com/d/msgid/golang-nuts/04eb41bd-9002-443b-8921-c3ddcd833c87n%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/542dd81b-2cad-4d5f-8f46-c308302a3c1en%40googlegroups.com.
