Gmail and K9 mail were working fine on my android phone.
Now find emails not being sent by both apps
Error appears to be
5.7.13 Authentication Denied (VM305)
Looking at posts on here, I tried looking on Spamhaus to see if my IP address was being blocked but it is not listed.
Mail from my tablet (K9 mail ans Gmail) and PC (outlook) being sent with no problems.
Any help appreciated.