Wedding Invitations & Paper

Can't find answer- Spelling out the state on the address

Hello,

I mentioned writing out the address on the STD envelopes and someone mentioned that writing out the state name can affect the speed of delivery of the invites/mail. (Affects the sensors and stuff)  After reading that, I changed all 105 of the addresses in my Mountain Cow software to the state's abbreviations.  All printed out and ready to send.

I know I have quite a bit of time before official invites, but I would like to get a head start if I have to input..lots of info.

Is it okay to leave it abbreviated state? 

Thanks in advance~
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