customer sees this message while redirecting to

customer sees this message while redirecting to Paypal:

SMTP Error! Data not accepted.

SMTP server error: s3nl1k0031NZ3hZ01 :: auth :: Message rejected for spam or virus content :: Please include this entire message when contacting support :: v=2.0 cv=Jd4+XD2V c=1 sm=1 p=affgFaYOAAAA:8 a=dLadDjfzjplSizcHzwvmfQ==:17 a=YQlvzqm3q-kA:10 a=JngOO-ZOwbEA:10 a=l8ib2V92jg0A:10 a=H9cIMGdfPkEA:10 a=oo_aTJS2PzkA:10 a=vYMDNeyr1X8A:10 a=67yJwss3He-nmE7pFikA:9 a=QEXdDO2ut3YA:10 a=JBFWd0y1dTsA:10 a=AtCREw16dzgj0q5B:21 a=fdgAgiYxdWtdgJG_:21 a=wW6fLSMZup4CME1OGzEA:9 a=_W_S_7VecoQA:10 a=2rhXFDQNhL2Dx_zH:21 a=oqyg8hdzdnTS7kTP:21
SMTP Error! Data not accepted.

SMTP server error: s3nl1k0011NZ3hZ01 :: auth :: Message rejected for spam or virus content :: Please include this entire message when contacting support :: v=2.0 cv=LfS+G0ji c=1 sm=1 p=affgFaYOAAAA:8 a=dLadDjfzjplSizcHzwvmfQ==:17 a=0KQecaLA-nAA:10 a=l8ib2V92jg0A:10 a=HlqUn5SAI6kA:10 a=WHsXhg87phMA:10 a=69EAbJreAAAA:8 a=jBnCzreUXGYA:10 a=ylsHGJmhGOYobfe1ngUA:9 a=QEXdDO2ut3YA:10 a=yDntIn8Q230A:10 a=KHhNoJUavc6Kvl2d168A:9 a=_W_S_7VecoQA:10 a=tXsnliwV7b4A:10 a=5pTwqQz_wgVXX7rg:21 a=ZpZ6IBrx1ccRt6uX:21 a=0b4Sy6l4HvnC3Cpd:21 a=dL

Have you edited an email in HikaShop > System > Emails ?

I think that you are giving some data which is badly formatted.

No, just found out customers are not receiving confirmation emails or order created emails as well.

Hi,

That error comes from your SMTP server. You should contact your STMP server provider (your hosting company probably) with that error message to ask them what is going on.