Hi All, 

We recently moved to a new mail security gateway and initiated an attack simulation training from Microsoft. The scenario include 2 recipient; one from exchange online(EXO) and the other is exchange 2019 mailbox(OP). 

OP mail flow will go through mail security gateway before delivering to enduser while EXO go through EOP. Thing is using same payload and simulation, email to OP user always show as garbled and the link inside will contain a space which break the link. Meanwhile email to EXO works just fine. 

I believe it has something to do with the encoding, does anyone come around this issue before? 

Thanks Y’all

​Hi All,  We recently moved to a new mail security gateway and initiated an attack simulation training from Microsoft. The scenario include 2 recipient; one from exchange online(EXO) and the other is exchange 2019 mailbox(OP).  OP mail flow will go through mail security gateway before delivering to enduser while EXO go through EOP. Thing is using same payload and simulation, email to OP user always show as garbled and the link inside will contain a space which break the link. Meanwhile email to EXO works just fine.  I believe it has something to do with the encoding, does anyone come around this issue before?  Thanks Y’all  Read More

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