Instead of Synapse
Synapse alternatives
Apps that do what Synapse does, from the email clients list, the ones you can start free with first.
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HCL Verse
Paid AndroidiPhoneMac+2 - 6
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Kopano WebApp
Free trial AndroidAPIiPhone+5 - 9
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Atmail Cloud
Free trial AndroidAPIiPhone+4 - 12
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The Bat!
Free trial Windows - 14
Boxy Suite
Free trial Mac - 15
MailMaven
Free trial Mac - 16
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GyazMail
Free trial Mac - 18
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Nmail
Paid AndroidExtensioniPhone+5 - 20
Eppie
Paid AndroidiPhoneLinux+2 - 21
HCL Notes
Paid AndroidiPhoneLinux+3 - 22
Mailove
Paid Linux - 23
MailRovers
Paid Mac