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Troubleshooting

Make more with Post SMTP with this pro extensions

Bad Request (invalid_grant)

Bad Request(invalid_grant)

It looks like Google has decided for the last few days to revoke the sending permission (Token) of a few websites.There isn’t a specific reason and actually someone wrote an article about all the potential reasons why Google Token can be revoked:https://blog.timekit.io/google-oauth-invalid-grant-nightmare-and-how-to-fix-it-9f4efaf1da35?gi=42d0553c60d5 Please notice: maybe you will see the error in other cases like a …

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Incorrect Authentication Data

Incorrect authentication data

SPF – The first MUST solution to try You need to create TXT record on your DNS.Change YOUR_HOSTING_IP with your website IP (hosting server):v=spf1 ip4:YOUR_HOSTING_IP include:spf.protection.outlook.com -all See here for more help: https://mxtoolbox.com/c/outboundemailsources?public=Office365 Cpanel Possible solutions: Login to CPanel > Tweak Settings > All> “Restrict outgoing SMTP to root, Exim, and mailman (FKA SMTP Tweak) and …

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