MTA-STS Check reports an error if there are too many MX records

[gg-chrisd]

Hi,

Our MTA-STS is working fine, but we get an error on the MTA-STS check which looks like it's due to the tool giving an error after checking the certificates of the first 6 MX records. As Gmail use 7 records currently it might be worth considering upping the number of certificate checks to ensure that the check completes successfully. :)