What is Mailsafe and how does it work?

ZoneAlarm's MailSafe feature detects e-mail attachments and warns the user about their presence. When a potentially dangerous attachment is detected (POP3 and IMAP protocols), ZoneAlarm "quarantines" it by changing its file extension so that it cannot be executed accidentally with its by default associated software.

For example, a file called TEST.BAT will be renamed TEST.ZL3, should the user chose to "quarantine" files with the BAT extension. That will prevent accidently execution of possible dangerous BAT file which could include malicious code. The file itself is not moved and will remain in its default directory. 

These "quarantined" files are not altered, so to restore the file functionality, simple renaming of the Mailsafe extension with its original file extension is sufficient.

ZoneAlarm Security Suite

List of renamed file extensions used by ZoneAlarm Mailsafe

Originally, ZoneAlarm's Mailsafe included only 37 default file types, that were intercepted in attachments and renamed. These were mostly Windows system files, or files that could contain visual basic or java scripts (like Access databases). These 37 documented files were:
 

Mailsafe renamed file extensions Original file extensions
file extension ZL0 is renamed ADE file extension
file extension ZL1 ADP
file extension ZL2 BAS
file extension ZL3 BAT
file extension ZL4 CHM
file extension ZL5 CMD
file extension ZL6 COM
file extension ZL7 CPL
file extension ZL8 CRT
file extension ZL9 EXE
file extension ZLA HLP
file extension ZLB HTA
file extension ZLC INF
file extension ZLD INS
file extension ZLE ISP
file extension Z0 JS
file extension ZLF JSE
file extension ZLG LNK
file extension ZLH MDB
file extension ZLI MDE
file extension ZLJ MSC
file extension ZLK MSI
file extension ZLL MSP
file extension ZLM MST
file extension ZLN PCD
file extension ZLO PIF
file extension ZLP REG
file extension ZLQ SCR
file extension ZLR SCT
file extension ZLT URL
file extension Z1 VB
file extension ZLU VBE
file extension ZLV VBS
file extension ZLW WSC
file extension ZLX WSF
file extension ZLY WSH


With newer version, more possible dangerous file types were added to the database by default.

Mailsafe file extension Original file extension
file extension ZLZ

is renamed ASX file extension

file extension ZM0 DBX file extension
file extension ZM1 MDA file extension
file extension ZM2 MDZ file extension
file extension ZM3 NCH file extension
file extension ZM4 PRF file extension
file extension ZM5 SCF file extension
file extension ZM6 SHB file extension
file extension ZM8 MHT file extension
file extension ZM9 ZIP file extension
file extension ZMA RAR file extension
file extension ZMB DLL file extension
file extension ZMC EML file extension
file extension ZMD OCX file extension
file extension ZME SYS file extension


Because users could also add more file types they want to intercept by MailSafe, the program would continue with the file extension scheme on the renamed files (ZMF, ZMG, ..), but the default types always had the same file extension.

 

Related software and links:

ZoneAlarm Pro icon

ZoneAlarm Pro    Microsoft Windows platform
A popular firewall software

 

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Related file extensions

z0 - ZoneAlarm Mailsafe renamed JS file

z1 - ZoneAlarm Mailsafe renamed VB file

zl0 - ZoneAlarm Mailsafe renamed ADE file

zl1 - ZoneAlarm Mailsafe renamed ADP file

zl2 - ZoneAlarm Mailsafe renamed BAS file

zl3 - ZoneAlarm Mailsafe renamed BAT file

zl4 - ZoneAlarm Mailsafe renamed CHM file

zl5 - ZoneAlarm Mailsafe renamed CMD file

zl6 - ZoneAlarm Mailsafe renamed COM file

zl7 - ZoneAlarm Mailsafe renamed CPL file

zl8 - ZoneAlarm Mailsafe renamed CRT file

zl9 - ZoneAlarm Mailsafe renamed EXE file

zla - ZoneAlarm Mailsafe renamed HLP file

zlb - ZoneAlarm Mailsafe renamed HTA file

zlc - ZoneAlarm Mailsafe renamed INF file

zld - ZoneAlarm Mailsafe renamed INS file

zle - ZoneAlarm Mailsafe renamed ISP file

zlf - ZoneAlarm Mailsafe renamed JSE file

zlg - ZoneAlarm Mailsafe renamed LNK file

zlh - ZoneAlarm Mailsafe renamed MDB file

zli - ZoneAlarm Mailsafe renamed MDE file

zlj - ZoneAlarm Mailsafe renamed MSC file

zlk - ZoneAlarm Mailsafe renamed MSI file

zll - ZoneAlarm Mailsafe renamed MSP file

zlm - ZoneAlarm Mailsafe renamed MST file

zln - ZoneAlarm Mailsafe renamed PCD file

zlo - ZoneAlarm Mailsafe renamed PIF file

zlp - ZoneAlarm Mailsafe renamed REG file

zlq - ZoneAlarm Mailsafe renamed SCR file

zlr - ZoneAlarm Mailsafe renamed SCT file

zls - ZoneAlarm Mailsafe renamed SHS file

zlt - ZoneAlarm Mailsafe renamed URL file

zlu - ZoneAlarm Mailsafe renamed VBE file

zlv - ZoneAlarm Mailsafe renamed VBS file

zlw - ZoneAlarm Mailsafe renamed WSC file

zlx - ZoneAlarm Mailsafe renamed WSF file

zly - ZoneAlarm Mailsafe renamed WSH file

zlz - ZoneAlarm Mailsafe renamed ASX file

zm0 - ZoneAlarm Mailsafe renamed DBX ile

zm1 - ZoneAlarm Mailsafe renamed MDA file

zm2 - ZoneAlarm Mailsafe renamed MDZ file

zm3 - ZoneAlarm Mailsafe renamed NCH file

zm4 - ZoneAlarm Mailsafe renamed PRF file

zm5 - ZoneAlarm Mailsafe renamed SCF file

zm6 - ZoneAlarm Mailsafe renamed SHB file

zm7 - ZoneAlarm Mailsafe renamed WMS file

zm8 - ZoneAlarm Mailsafe renamed MHT file

zm9 - ZoneAlarm Mailsafe renamed ZIP file

zma - ZoneAlarm Mailsafe renamed RAR file

zmb - ZoneAlarm Mailsafe renamed DLL file

zmc - ZoneAlarm Mailsafe renamed EML file

zmd - ZoneAlarm Mailsafe renamed OCX file

zme - ZoneAlarm Mailsafe renamed SYS file

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