[brownrexx]

I mailed some okra seeds earlier this year and I have asked the postal clerk to hand stamp the envelope and she said something about non machinable or something like that.

She used a special stamp that would keep it out of the automated system. I may have paid a few cents extra but I don't really remember.

I just googled this and apparently these non machinable letters need to be thin also and there is a 15 cent surcharge so it won't help with thicker envelopes but it may be good if you want to mail some seeds that you consider to be fragile.