Option to require phone number on forms. If you want to require custom fields, please upvote Option to make custom fields are required for specific online forms, without having them be required for manual entry
Adding merge variables in the subject line, especially the FIRST NAME. For an email communications tool, it is an extremely important feature for improving open and click-through rate (CTR).
Create envelope when printing an individual letter
It would be great - upon manually entering a donation or acknowledging a donation to add a print option for the envelope as well - not just the Thank you/Acknowledgement letter.
I would love to be able to sort a batch of letters alphabetically by name. This would help with matching up labels or envelopes to the letters. It would also reduce errors when you have to segment the batch so that multiple volunteers can work on ...