The next minor palindrome will be on 22.4.22. This can only be found on the small date stamps. It is also a great time to send a Hari Raya Greeting Card… though it might arrive after Raya but it is a great date! If you are planning the National Mail centre cancellation, post a bit early to ensure it is collected and transferred to the Mail Centre on time!
Good luck in sending a mail to yourself and your friends!
Here are the other palindrome dates for the rest of the year:
22.5.22 (also minor ambigram)
22.8.22 (also minor ambigram)
22.11.22 (also minor ambigram)
As there are post offices that open 7 days a week and with a combination of different states, should be able to get most of them this year!