Issue Plesk is not receiving emails from Gmail or mail received after delay(from 12 min to 1,2 days)

[saqib.mustaqeem]

Server operating system version

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Plesk version and microupdate number

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Hi,
As an ISP our clients are facing serious issue regarding incoming emails from Gmails ,The Emails from Gmails are missing or receiving after long delay.
Please note that :

1. The Outgoing Emails to Gmail has no issue.
2. There is no issue from Yahoo or Hotmail.
3. Issue started from 20th Oct,
4. I have try to contact Gmail community but no response.

Please Replay if any more information required,

 

[nucknuck]

I don´t know if I understood it in detail, but I tried this:

1) sent a test mail from my gmail account to my plesk hosted mail account
2) checked my inbox
3) checked mail.log

It took about 15 seconds for getting this mail.

 

[mow]

Did you mess with the greylisting whitelists?
Check the output of plesk bin grey_listing -i. Is *google.com in there?