What DKIM RSA key length to use

Hello, I only recently started to use DKIM and DMARC. (Yesterday to be exact. Now mails to Gmail go to the inbox and not the spam-folder. Which is nice.) I started with a 1024 bits RSA key. I followed

Re: What DKIM RSA key length to use

In the filter-dkimsign readme I suggest to use 2048 and I stand by it. >From RFC1035: is a single length octet followed by that number of characters. is treated as binary information, and can be up to 256 characters in length (including the length octet). Followed by: TXT-DATAOne or