What should happen: When adding a dkim entry with key length 2048 by using the upload form, the dkim key should be splitted automatically into 2 or more substrings after 255 characters. What happens: During the update process of the DNS record the string is splitted, but every time one character gets lost. How to reproduce: Use the following public key created by google as a sample: v=DKIM1;k=rsa;p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAru+Y5R7xnLWYjvOxcHwpOo6d4NhoLjeIXwKP8GwgkUhxq9ypcEkr1k1EizprsGsu6AgP3Yrp8Ukce+k4kE5RBywt4XeIXKcdpggC7Kv2emZJCimAygCnz90h7ZMp1e67S00i1uIEPQ8/1i1CpNeV68aNxzScAJBUjCE25Qu5e2eFnFZgLj4Kzrl6xHM7SpvdPrWsYyQ8kKqxzOLFE6ur2SmuuckHrIlqy3P006EEBIlYjk2EfkgE9WL6n/UQSS49izCT0pAr9357zftUke9Oz4ah4YYDN2bZI1QMlQNhEhACM+jGWhGQKIswWsFasIATw3FVrRrmCcVGvcbtScpE/wIDAQAB Create a new txt record by using the web form, use the content from step 1 Update the DNS record Check the content of the new txt record and you will find that 1 char is missing What else: Also happens if the content is first manually splittet into two substrings, regardless of the position of the split. I.e. it does not matter if the manual split is provided at position 200, 255, 256, 257 ... Tested with Chrome and Mozilla