Attachment Restrictions Explained
Our virus protection scans all inbound and outbound emails using a multi-stage process. The first stage of this process is through restricted attachments. Here, emails are scanned for dangerous types of file attachments. When an email is received that contains a restricted file attachment, the email is rejected and the sender receives a "bounced" email notification informing them of the restriction.
The following is a list of restricted attachments:
| ade | adp | app |
| asp | aspx | asx |
| bas | bat | cer |
| chm | cmd | cnt |
| com | cpl | crt |
| csh | der | exe |
| fxp | gadget | hlp |
| hpj | hta | htc |
| inf | ins | isp |
| its | js | jse |
| ksh | lib | lnk |
| mad | maf | mag |
| mam | maq | mar |
| mas | mat | mau |
| mav | maw | mda |
| mdb | mde | mdt |
| mdw | mdz | msc |
| mht | mhtml | msh |
| msi | msp | mst |
| msh1 | msh2 | mshmxl |
| msh1xml | msh2xml | ops |
| osd | pcd | pif |
| plg | prf | prg |
| pst | reg | scf |
| scr | sct | shb |
| shs | sys | ps1 |
| ps1xml | ps2 | ps2xml |
| psc1 | psc2 | tmp |
| url | vb | vbe |
| vbs | vpb | vsmacros |
| vss | vst | vsw |
| vxd | ws | wsc |
| wsf | wsh | xnk |
| xml |
Even if the message does not contain one of these restricted attachments, it will still be scanned at other stages for any potential viruses. If it is determined that the message did contain a virus, it will not be delivered.
