same with an exchange server. 
Does anybody have a suggestion how to get the TLS certificate from an
exchange mail server with openssl?

[EMAIL PROTECTED] ~]$ openssl s_client -connect mail.buuuuuu.ch:25
-starttls smtp -debug
CONNECTED(00000003)
read from 09AC93A8 [09AC4130] (8192 bytes => 120 (0x78))
0000 - 32 32 30 20 6d 61 69 6c-32 1e 62 75 6f 62 73 72   220 mail2.buuuuu
0010 - 61 45 62 2e 63 68 20 4d-69 63 72 6f 73 6f 66 74   uub.ch Microsoft
0020 - 20 45 53 4d 54 50 20 4d-41 49 4c 20 53 65 72 76    ESMTP MAIL Serv
0030 - 69 63 65 2c 20 56 65 72-73 69 6f 6e 3a 20 36 2e   ice, Version: 6.
0040 - 30 2e 33 37 39 30 2e 31-38 33 30 20 72 65 61 64   0.3790.1830 read
0050 - 79 20 61 74 20 20 53 61-74 2c 20 31 36 20 44 65   y at  Sat, 16 De
0060 - 63 20 32 30 30 36 20 31-33 3a 34 35 3a 30 38 20   c 2006 13:45:08
0070 - 2b 30 31 30 30 20 0d 0a-                          +0100 ..
write to 09AC93A8 [BFF21D30] (10 bytes => 10 (0xA))
0000 - 53 54 41 52 54 54 4c 53-0d 0a                     STARTTLS..
read from 09AC93A8 [09AC2128] (8192 bytes => 28 (0x1C))
0000 - 35 30 33 20 35 2e 35 2e-32 20 53 65 6e 64 20 68   503 5.5.2 Send h
0010 - 65 6c 6c 6f 20 66 69 72-73 74 0d 0a               ello first..
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