| Client Name | Configuration instruction or additional information |
| Eudora 3.x and Lite | not supported, you must upgrade to a later version |
| Eudora 4.x | see here. |
| Eudora 5.x | see here. |
| Netscape 3.x | not supported, you must upgrade to a later version |
| Netscape 4.0x | see here. |
| Netscape 4.x and 5.x | see here. |
| Netscape 6.x | see here. |
| Outlook Express 4.x or 5.x | see here. |
| PegasusMail 3.1 | see here. |
| Outlook 97 | not supported, you must upgrade to a later version |
| Outlook 98/2000/2003/XP | see here. |