Well, I'll go out on a limb and post the entire error message, SSL certificate, and real domain name:
Mail can't verify the identity of "larsonsystems.com".The certificate for this server was signed by an unknown certifying authority. You might be connecting to a server that is pretending to be "larsonsystems.com" which could put your confidential information at risk. Would you like to connect to the server anyway?
omicron.lunarpages.comRoot certificate authority
Expires: Saturday, January 3, 2009 11:43:32 PM CT
This root certificate is not trusted.DetailsSubject NameCountry: US
State/Province: Unknown
Locality: Unknown
Organization: Unknown
Organizational Unit: Unknown
Common Name: omicron.lunarpages.com
Email Address:
ssl@omicron.lunarpages.comIssuer NameCountry: US
State/Province: Unknown
Locality: Unknown
Organization: Unknown
Organizational Unit: Unknown
Common Name: omicron.lunarpages.com
Email Address:
ssl@omicron.lunarpages.comSerial Number: 6956915690
Version: 3
Signature Algorithm: MD5 with RSA Encryption ( 1 2 840 113549 1 1 4 )
Parameters: none
Not Valid Before: Friday, January 4, 2008 11:43:32 PM CT
Not Valid After: Saturday, January 3, 2009 11:43:32 PM CT
Public Key InfoAlgorithm: RSA Encryption ( 1 2 840 113549 1 1 1 )
Parameters: none
Public Key: 128 bytes : EA 80 F8 85 6F 2F F3 BE 55 1A 33 39 82 3F 73 FE A9 D1 2E 86 13 6C ED 24 BC 21 CC C8 F6 07 50 DB E4 B8 35 72 9B DB EA 43 34 93 2B 15 CB E1 A1 FD E9 BC 30 0B D2 22 C7 F9 FF 28 2B 77 AE C0 C4 8D 32 08 A2 49 38 87 F3 D6 C8 1C BB 68 C6 C2 10 5D B0 43 D1 F4 59 FF FF 73 3C A8 D9 9A FE B9 16 4F 23 31 11 E0 F9 2E 33 88 4E D2 01 13 8F 64 FC 0F 1D 37 06 EE 7C 16 EA AB 3D 07 2A F9 8A 5D 5A F7
Exponent: 65537
Key Size: 1024 bits
Key Usage: Any
Signature: 128 bytes : A5 0D 45 D9 B3 DE AA 99 8F EC 07 CD 34 71 47 B0 DA 1C 20 59 EA 20 62 1E E6 6A 4B A6 F1 95 97 E0 1D A3 D7 1D 78 6E 14 71 BE 2D F5 D9 18 ED 17 1A 16 83 72 5B 81 5A DA B1 35 D6 25 03 4B 8E 8A AB 81 B8 42 0F 66 A3 8E 7B 8F 7C 8A 03 58 40 BE 1F 22 AD D7 51 FD 83 4F 96 1D 9A F8 AB 1F 39 F3 84 1D 26 5F D9 AF 0C 49 9F 2D 01 6E ED 05 3E 28 1D 50 86 11 C1 3A 1A F0 5A C4 E7 36 B2 44 61 7C 24
Extension: Basic Constraints ( 2 5 29 19 )
Critical: NO
Certificate Authority: YES
Extension: Subject Key Identifier ( 2 5 29 14 )
Critical: NO
Key ID: 23 78 03 A4 91 15 B5 26 C7 54 CA 1D D7 24 A0 CF E7 6B 89 AE
Extension: Authority Key Identifier ( 2 5 29 35 )
Critical: NO
Key ID: 23 78 03 A4 91 15 B5 26 C7 54 CA 1D D7 24 A0 CF E7 6B 89 AE
Directory Name
Country: US
State/Province: Unknown
Locality: Unknown
Organization: Unknown
Organizational Unit: Unknown
Common Name: omicron.lunarpages.com
Email Address:
ssl@omicron.lunarpages.comSerial Number: 01 9E AA 1B EA
FingerprintsSHA1: 06 10 31 A1 9B 14 A9 F8 E5 BE 0C 66 DC DD D8 10 95 AB 52 A3
MD5: C1 D5 1F C6 63 81 DA 1F C1 B9 F9 5C A3 DC 03 36
Mail does provide a checkbox that says "Always trust 'omicron.lunarpages.com' when connecting to 'larsonsystems.com'" but it doesn't seem to stick (curiously I am prompted twice for my admin password). Additionally, I do have a drop-down menu that allows me to "Always Trust" when using this certificate, which I have not tried yet.
I am more interested in finding and fixing the root cause of this issue. It's generally not a good idea to just accept things like this IMO.