Checking Your Wedding Mailing List for Errors

Missing apartment or unit numbers. Guests who live in apartments frequently give only their building address without the unit number, especially when submitting via text or social media message.

If your ZIP codes are stored as numbers, re-format the column as text in your spreadsheet and manually add the leading zero to any 4-digit ZIP codes. Export as CSV after fixing.

For larger lists (100 or more invitations), USPS address verification is worth doing. Several free tools will validate your list against the USPS database. However, grade your CSV first to fix structural issues before running validation.

Have your complete address list finalized and graded at least 4 weeks before your desired mail date. If you are using calligraphy addressing, allow 8 weeks.

No. The grader checks the structure and completeness of your address data but does not verify addresses against postal databases. Use a USPS verification tool for existence checking after your CSV grades well.

Yes. Your CSV is analyzed entirely in your browser using JavaScript. No data is uploaded to any server, ever. You can verify this by disconnecting from the internet before uploading.

Currently we support .csv files. If your data is in Excel (.xlsx), Google Sheets, or Numbers, export it as a CSV first.

Your grade is a weighted score based on column coverage (30%), data completeness (50%), and data quality (20%). An A means your list is wedding ready. A C or below means there are gaps that could cause problems. The grader checks for 22 standard wedding planning columns, including RSVP status, meal choice, table assignments, invitation tracking, and address fields used by venues and caterers.

The fastest way is to import your list into iDoTogether. Each household gets a personal link you can text or email. Guests fill in their own address, RSVP, meal choice, and dietary restrictions from their phone. No spreadsheet editing required. Most couples go from a D to an A in 48 hours without touching a single cell.

It gets expensive fast. Returned mail costs $2 to $3 per piece (stamp + envelope + reprint). Duplicate names mean double invitation suites at $4+ each. Missing emails mean you can't send digital RSVPs, so you're chasing people by phone. Missing meal choices mean your caterer adds a buffer charge. Most couples don't discover these gaps until the week invitations ship.

Absolutely. Planners use the grader to audit client lists before handoff to stationers and caterers. Many recommend iDoTogether to their couples as the collection tool because it eliminates the back and forth of chasing guests for addresses and RSVPs.

Manually auditing a 150 person guest list takes 30 to 60 minutes and you'll still miss things. The grader checks 22 columns, detects duplicates via fuzzy matching, flags partial addresses, and calculates fill rates, all in about 10 seconds.

Completely free, no account required. We built this to help couples planning their wedding. If you want to take it further, iDoTogether has a free tier for up to 50 guests and a one time $99 upgrade for unlimited.