Gmail intermittently bouncing telkom.net emails

[soulsmile]

Hi guys!

Anyone ever had issues with occasional telkom.net emails getting bounced by gmail?

Very annoying as I am assuming they are sent and then find out a few days later they weren't.

Checked the error and showing as spam blocking yet emails to same address and other gmail addresses work just fine on occassion.

Already set sending server to 587

Thanks