We are phasing out Zendesk. Please see Discourse instead: https://community.getmailspring.com/t/about-mailspring-pro-subscriptions/304
Mailspring Pro doesn't place any limits on the number of email accounts you connect. You're free to add as many email accounts as you'd like from Preferences > Accounts. Each account appears in the left sidebar and you can use all of Mailspring's pro features, like read reciepts, send later, and snoozing.
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