| Subject | Welsh | English |
| comp., MS | gweinydd post | mail server (A computer that stores email messages) |
| comp., MS | gweinydd post SMTP | SMTP mail server (An e-mail server that uses the Simple Mail Transfer Protocol (SMTP)) |
| comp., MS | rôl gweinydd Blwch Post | Mailbox server role (An Exchange Server 2007 server role that provides e-mail storage and advanced scheduling services for Microsoft Office Outlook users. The Mailbox server role also includes public folders, which provide a foundation for workflow, document sharing, and other forms of collaboration) |