The functionality of sending mail and attachments of CSV files is not working.
We are not able to understand what the issue could be.
the error is showing
Error 554 5.7.8: Acess Restricted
We use an SMTP client to send mail to the same mail ID.
Can we use Gmail for it? how to implement it?
Is there a better alternative for this functionality of sending mail and attachments together?
After a small research it seems that this error occurs when you try send an email to a non-existing email adress…
You can find a page dedicated to error codes on my site:
https://www.professorcad.co.uk/appinventorerrormsgs
....but I don't have any SMTP errors listed (have to change that).
Contrary to HQ2000, my finding is that the error occurs on trying to send an email. That would either be an Android restriction (what Android version is the App running on?), device manufacturer restriction or an SMTP service supplier restriction.
So in total, four possible reasons 
