Email forwarding is magic when it works, and a nightmare when it doesn't. The most common complaint we hear from people migrating from DIY solutions is: "My emails just disappear."
Almost always, this is due to one of the following 7 mistakes. Email protocols were designed in the 1980s, but spam filters are modern and aggressive. If you break the rules, you get blocked.
Mistake #1: Ignoring SPF Records
The Error: You buy a domain but don't add the Sender Policy Framework (SPF) record for your forwarding service.
The Consequence: Destination servers (like Gmail) see an email claiming to be from your domain but coming from an unauthorized server. They block it immediately.
The Fix: Add a TXT record to your DNS: v=spf1 include:_spf.forward.redsols.com ~all (replace with your provider's specific record).
Mistake #2: Missing DKIM Signatures
The Error: Sending mail as "you@yourdomain.com" without a cryptographic signature.
The Consequence: Emails are treated as "unverified" and are highly likely to hit the spam folder, especially with strict filters at Outlook/Hotmail.
The Fix: Ensure your forwarding or sending service provides DKIM keys (usually CNAME records) and that you add them to your DNS.
Mistake #3: Using a Forwarder Without SRS
The Error: This is the technical one. When User A (yahoo.com) emails You (yourdomain.com), and you forward it to Destination (gmail.com), the email arrives at Gmail claiming to be from "yahoo.com" but sent by "yourdomain.com's server."
The Consequence: Yahoo's DMARC policy says "Reject mail claiming to be from Yahoo that isn't from Yahoo's servers." Gmail obeys this and rejects the email. You never see it.
The Fix: Use a forwarding service that implements SRS (Sender Rewriting Scheme). SRS rewrites the envelope sender address so it passes SPF checks at the final destination.
Mistake #4: Forwarding Spam to Gmail
The Error: You set up a "catch-all" alias and forward absolutely everything to your personal Gmail, including thousands of spam messages.
The Consequence: Gmail sees your domain forwarding tons of spam. Their AI decides your domain is a spam source. Your reputation tanks.
The Fix: Use a forwarding service with built-in spam filtering. Do not forward known spam. Disable catch-all if you are under attack.
Mistake #5: Setting DMARC to "Reject" Too Early
The Error: You read a guide saying "DMARC is good!" so you set your policy to p=reject immediately.
The Consequence: If you made any mistake in Step 1 or 2 (SPF/DKIM), legitimate emails will bounce. You essentially DoS'd yourself.
The Fix: Start with p=none (monitoring mode). Watch the reports. Once you are sure all your legitimate mail streams (forwarding, marketing emails, CRM) are signing correctly, move to p=quarantine and finally p=reject.
Mistake #6: Using "Toxic" TLDs
The Error: Buying a cheap .xyz, .top, or .info domain for business email.
The Consequence: Because these domains are cheap (often $1), spammers buy them in bulk. Spam filters inherently trust .com, .io, or .net more than .biz or .review.
The Fix: Stick to reputable Top-Level Domains (TLDs) for your primary email identity.
Mistake #7: No Reverse DNS (PTR)
The Error: (Only applies if you host your own server). Your server's IP address doesn't have a PTR record resolving back to its hostname.
The Consequence: Immediate rejection by most major providers.
The Fix: If you self-host, configure rDNS at your VPS provider. Better yet, use a managed forwarding service so you don't have to worry about server infrastructure.
Summary
Email is harder than it looks. A managed service handles SRS, PTR, spam filtering, and reputation monitoring for you. If you are DIY-ing it, double-check your DNS records right now!