Email and Spam Filtering

Thunderbird Setup

Click here for detailed directions for setting up Thunderbird Mail Client

Spam Filtering

The new puremessage spam filtering system seems to be working well, even with the low aggressiveness setting that was given to everyone. You can manipulate various email related functions with the coxeter commands:

  • spamfiltering (for setting the spam filtering aggressiveness level and controlling autodeletion and autoexpiration of spam messages)
  • maillistedit (for adding email addresses to your whitelist and blacklist)
  • forwardedit (for changing email forwarding)
  • vacationmessage (for sending vacation messages when you are away)

Type any of the above commands followed by the word show (e.g. spamfiltering show) to see your current status, or followed by help for more information. For complete information about your spamfiltering setup you can type spamfiltering showall. Note that email forwarding and sending the vacation message happens after spam filtering so less spam should be sent from our system to remote addresses now (this has caused problems in the past).

There is now a (minimalistic) graphical interface to configuring your spam filter settings on coxeter called spamfiltering_gui. Please see the IT Status Blog article at Controlling spam in your email for more information.

General Email Server Information

  • Incoming Mail Server: mail.math.toronto.edu using IMAP on port 143 using a secure TLS connection (STARTTLS)
  • Outgoing Mail Server: smtp.math.toronto.edu using message submission (similar to SMTP) on port 587 using a secure TLS connection (STARTTLS)

The fingerprints for our email security certificate are:

  • SHA1: 15:D7:00:1C:B4:5A:9D:AF:D1:B0:4D:35:EA:83:1A:2E:3D:85:36:0D
  • SHA-256: 68:CE:0A:32:8A:4F:81:CB:AD:AB:E1:B1:97:47:2D:6C:99:E5:88:B0:CF:FF:B2:09:DB:C5:33:78:2C:60:70:89

Although these fingerprints can in theory be faked by people trying to steal information.

The Certificate Signature Algorithm and Value:

PKCS #1 SHA-256 With RSA Encryption

Size: 256 Bytes / 2048 Bits
1c 54 99 3b 35 47 a1 23 70 9e 60 ae 21 f8 8b e7
4b 3c b4 2a 44 c0 2b 46 8a 58 d5 72 19 b9 a8 ec
10 ca 18 1e b9 43 8b f6 8e fb f6 e5 42 a0 05 05
53 03 f5 d1 3a 64 3d 7e a4 d6 22 f7 ac df db 2f
5a 4e b1 79 1b cc c5 ce ba c0 e5 1b 28 0c a3 9c
f6 a4 72 90 b3 82 d3 c5 2d bf 6a 37 3a c7 6a f2
c0 b1 00 5d b6 fc 78 7e 14 23 50 06 60 dc ff 41
61 84 33 24 40 20 ea f4 d6 58 48 77 90 1a ba 04
d3 f9 f8 25 98 02 d4 fc 5d 49 3b 51 f3 be ca 62
28 14 a9 d3 8c ec ea d5 70 9c 41 2c 34 2e 3e 23
3a 3d 65 63 21 a7 79 d0 f4 2d df 67 4e 3f 51 ce
16 a2 8e 58 85 6d 09 8a 64 81 05 9c da 24 52 46
f9 8d 57 44 d6 b6 d5 cd b4 ad f6 1b 68 7b 26 26
84 98 3f 23 78 9c e5 00 43 42 b6 73 85 71 3c 9e
26 1f a4 b2 ef b9 55 1f 8d e7 d1 84 8d 9a 3a 73
c9 a2 90 a5 54 57 a3 3e bf 65 f6 37 ed 6e 4d 17

This complete certificate signature is felt to be secure.