How many maximums can I specify in openSSL emailAddress_max

Is there anyone know what is the maximum size of email address in making Certificate with openssl. I just edit emailAddress_max to 129 and got this error.

 []:Email Address []:problems making Certificate Request
140318740027032:error:0D07A097:asn1 encoding
routines:ASN1_mbstring_ncopy:string too long:a_mbstr.c:158:maxsize=128

so 128 is the max size?