Max size for .jpg attachment is 781.3 Kb, so you pretty much always have to resize photos. Alternately, you can upload the photo in full resolution on any number of free hosting sites, such as imgur, and insert the photo into your post using the [IMG] tag.
__________________
2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |