Tried everything, still cant get notifications working (SMTP). now its an 'invalid HELO name error'

we’ve tried all settings suggested here, on support forums, and by our hosting company but after weeks of trying the notifications are still not working.

no error message in the application any more, but just won’t connect when adding settings.

can anyone suggest what might be causing this exasperating error?

Hi @AndyatFocallocal, could you confirm the SMTP server is correctly configured by testing it with another application?