Hi,
it seems, that hotmail send a bare LF in the added signature (and violates RFC).
qmail drops the connection afterwards: 451 See http://pobox.com/~djb/docs/smtplf.html
no helpfull response from hotmail: https://windowslivehelp.com/community/t/121824.aspx
Kind regards, Ingo Flaschberger
Which added signature?
hotmail added: 0000006A 52 65 63 65 69 76 65 64 3a 20 66 72 6f 6d 20 53 Received : from S 0000007A 4e 54 31 32 34 2d 57 32 38 20 28 5b 36 35 2e 35 NT124-W2 8 ([65.5 0000008A 35 2e 39 30 2e 37 5d 29 20 62 5.90.7]) b 00000094 b5 c4 d3 ca bc fe 2d 2d 0d 0a 46 72 6f 6d 3a 20 ......-- ..From: (removed) (removed) 000000BE b0 cf e4 a1 a3 b1 be b3 b5 bc db b8 f1 ca c7 34 ........ .......4 000000CE 33 30 d4 aa a3 ac d5 e2 bf c9 ca c7 c5 e4 cc d7 30...... ........ 000000DE c6 eb c8 ab b5 c4 bc db b8 f1 ........ .. 000000E8 0d 0a 0d 0a d2 f8 c9 ab b5 c4 0d 0a 0d 0a 0d 0a ........ ........ 000000F8 b4 cb d6 f7 cc e2 cf e0 b9 d8 cd bc c6 ac c8 e7 ........ ........ 00000108 cf c2 a3 ba 0d 0a 0d 0a 0d 0a ........ .. 00000112 a2 bf cc cf c2 d4 d8 a3 a1 0d 0a 0d 0a 0d 0a 0d ........ ........ 00000122 0a ca b9 d3 c3 d0 c2 d2 bb b4 fa 20 57 69 6e 64 ........ ... Wind 00000132 6f 77 73 20 4c 69 76 65 20 4d ows Live M 0000013C b5 bd d5 e2 bf c9 b0 ae b5 c4 b3 b5 b3 b5 ba f3 ........ ........ 0000014C be cd c4 dc bf aa d0 c4 b5 c4 c6 ef d7 c5 cb fc ........ ........ 0000015C a3 ac cb f9 d2 d4 ce d2 be a1 ........ .. 00000166 0a 0d 0a cd fe cd fb a3 ba 30 0d 0a 0d 0a ce c4 ........ .0...... ^^ here 00000176 d5 c2 a3 ba 32 38 36 0d 0a 0d 0a b9 b1 cf d7 a3 ....286. ........ 00000186 ba 31 39 37 34 0d 0a 0d 0a d7 .1974... .. Kind regards, Ingo Flaschberger