I have many work email and would like to simplify the work by add it to my Gmail's "Send mail as", so that I only have to check and process mail in 1 mailbox.

But when I add an email me@my-company01.com (Google Suite) to me@gmail.com, it throws error (image below).
What can I do for solve it?


  • I could successfully login to web with username/password provided
  • I've confirmed with my-company01's IT Dept, they said that "no restrictions at all".
  • I've enabled "Less secure apps" in my me@my-company01.com setting
  • I've successfully add another company email (me@my-company02.com - Office_365) in me@gmail.com)

Error 535-5.7.8 Username and Password not accepted


After disabled and re-enable Less secure app, it works now.

Update 2020-09-23

After some tries, I found the final solution for "check mail from multiple account (me@comp1, me@comp2...) from 1 email only (me@gmail.com)"

  1. Login to me@comp1.com
  2. Go to Settings / See all settings / Forwarding and POP/IMAP
  3. Set it to Forward mail to me@gmail.com
  4. Login to me@gmail.com
  5. Go to Settings / See all settings / Account & Import
  6. Add me@comp1.com to Send mail as, remember to choose "Reply from the same address the message was sent to"

set it to Forward mail to me@gmail.com Add me@comp1.com to Send mail as

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