IT

Server error: '553 5.1.2 RFC-5321 address. l11sm37848383pfb.56 - gsmtp'

2018.03.07


Server error: '553 5.1.2 RFC-5321 address. l11sm37848383pfb.56 - gsmtp'

re-verify your client's access via the web. To do that, one of these two can work:
1) Unlock Captcha
2) Less Secure Apps
If that isn't working, you may also need to enable Access for less secure apps. That option is found on your Security page of your Google account, under "Access for less secure apps."
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