Thank you for your responses guys and much appreciated on the info regarding tickets being done here. Makes sense now! 🙂
I'm using SMTP
I've been having a lengthy back and forth with Namecheap and it seems to be boiling down to... Subject line encoding?
For example, in the EML file of my failed test email from Admin CP I can see this as the Subject line:
Subject: =?UTF-8?B?VGVzdCBFbWFpbA==?=
Since... Oooooh wait. I get it now... So like is mentioned in my topic title. There are two base64 errors:
FROM_EXCESS_BASE64 and SUBJ_EXCESS_BASE64
I only realized now that those two errors are implying there is an issue with the "From" line and the "Subject" line. Interestingly enough, I can see that in addition to the Subject that the From line is also gobbledygook:
From: =?UTF-8?B?RGFya01hdHRlcnM=?= <noreply@darkmatters.org>
So i think this either an encoding issue (software side?) or a decoding issue (mail server side?)
Is there a way to observe the email being generated by the forum software Admin CP test email before it gets interpreted by some other party?