bandwidth overheads for mail with ssl
I have been reading that the overheads of encryption in HTTP protocol is negligible. Is the same true for SMTP too ?
If I send a mail encrypted will the bandwidth consumption be any significantly larger ?
I did a research project on this a few years ago. 1700 data points changing every parameter we could think of, including SSL vs plaintext. We discovered, rather to my surprise, that over practical Internet links SSL was 33% as fast as plaintext. I expected it to me much slower.