Features
Features


IDMail serverSupport Linux/UnixSupport WindowsSupport Windows1SMTPPOP3IMAPIMAP IDLESMTPoverTLSPOPoverTLSIPv6NNTPSSLWebmailActiveSyncStorage (Database)Storage (Filesystem)Storage (Other)Users License
31NetMailYesYesNoYesYesYes?YesYes??YesYesNoYesNoNoProprietary
32OpenSMTPDYesNoYesYesNoNoNoYesNoYesNoYesNoNopossible through custom backendsYesNoISC
33Open-XchangeYesNoNoYesYesYes?YesYes??YesYesYesYesNoNoProprietary/SaaS, with open-source parts
34Oracle Communications Messaging ServerYesNoNoYesYesYes?YesYes?NoYesYesNoYesYesNoProprietary
35PostfixYesNoYesYesDovecot,UW IMAPDovecot,UW IMAPDovecot,UW IMAPYesNoYesNoYesNoNoYesYesYesIBM Public License
36qmailYesNoYesYesYesDovecot,UW IMAPDovecot,UW IMAPNoDovecot,UW IMAPvia Qsmtp?NoNoNo(cdb)YesNoPublic domain
37QpopperYesvia CygwinYesNoYesNoNoNoYes?NoYesNoNoNoYesYesBSD-style, GPL-incompatible
38SendmailYesNoYesYesDovecot,UW IMAPDovecot,UW IMAPDovecot,UW IMAPYesNoYesNoYesNoNo?Yes?Sendmail License
39SparkEngineYesYesYesYesNoNoNoYesNo?NoYesNoNoYesYesYesProprietary
40Synovel CollabsuiteYesNoNoYesYesYes?YesYes??YesYesNoYesYes?Proprietary with OSS parts,Freeware and paid editions
41UW IMAPYesYesYesNoYesYesYesNoYes?NoYesWebPineNoYes (Indexes)YesNoApache License 2.0
42WinGateNoYesNoYesYesYesYesYesYesNoNoYesYesNoNoYesNoProprietary
43XeamsYesYesYesYesYesYesNo???NoYesNoNoYesNoNoProprietary(unlimited private/commercial use, support with SLA requires a license)
44ZarafaYesNoNoExternalYesYesYesExternalYesNoNoYesYesYesYesYesNoAGPLv3, free and paid editions
45ZentyalYesNoNoYesYesYesYesYesYesNoNoYesYesYesYesYesNoGPLv2
46ZimbraYesNoYesYesYesYesYesYesYesNoNoYesYesYesYesYesNoZPL and proprietary editions

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