Here's why.

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There are a million and one details to remember when planning a wedding. From boutonnieres to the correct time to send out your Save the Date cards, it's easy to overlook aspects of the wedding that aren't as pressing as the date, venue, flowers, cake, and of course, the dress. According to one Reddit thread, there's more to worry about with your wedding invitations than the cardstock and font.

Although etiquette pros recommend the return address go on the back flap of the envelope (and it looks prettier there), there's one issue you should watch out for with this format. In some circumstances when the return address is on the back flap of the envelope, mail sorting machines have mistaken the back of the envelope for the front, resulting in wedding invitations returning to the sender.

After perusing multiple Internet forums and articles, it seems rare that this occurs, but there are several ways you can lessen the likelihood of it happening to you. Be sure the address on the front is larger and more prominent than the one on the back. One way to distinguish between the addresses and to save time while stuffing envelopes is to get a return address stamp in a fun shape. You can also hand-deliver the envelopes to the post office and express your concern to the postal worker, who can hopefully give you confirmation and peace of mind that you won't be receiving any invitations back.

We don't think this will happen to every bride who puts her return address on the back of the wedding invitation envelopes, but when it comes to your wedding day, it's better safe than sorry when taking planning precautions.

WATCH: Everything You Need To Know About Wedding Etiquette

Whether guest, bride, or attendant, we could all use a brush up on our wedding etiquette. Gayden Metcalfe and Charlotte Hays, Southern etiquette experts and authors of Being Dead Is No Excuse, Somebody Is Going To Die if Lilly Beth Doesn't Catch That Bouquet, and Some Day You'll Thank Me for This, have everything you need to steer clear of any etiquette issues you might encounter.

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