Gmail rejections driving me up the walls

Detailed response from Gemini:

What you are experiencing is the fallout of major, sweeping security updates implemented by Gmail, Yahoo, and other major email providers.
In short, the old way of sending email (relying solely on basic SPF and an ISP’s SMTP server) is effectively dead. Gmail now aggressively filters or outright drops ("black-holes") emails that do not pass strict authentication standards. Because you are routing your emails through your ISP's SMTP server, your setup is failing these checks.

Why Your Emails Are Disappearing

Your current email setup relies on a fundamental contradiction that modern spam filters hate:

Your Domain Name (Freehostia)  ——>  Sent via ISP SMTP (Vodafone, Comcast, etc.)  ——>  Gmail

1. The SPF Game of Whack-a-Mole: You mentioned trying to maintain 7 IP addresses in your SPF record. ISPs dynamically change, load-balance, and add new outbound mail servers constantly. If your ISP routes your email through an 8th IP address you haven't whitelisted, your SPF fails, and Gmail rejects the email.
2. Missing DKIM (The Real Culprit): Gmail now heavily relies on DKIM (DomainKeys Identified Mail). DKIM adds a cryptographic signature to the header of your email. Because you are composing in Thunderbird and blasting it through a generic ISP SMTP server, your emails lack a signature matching your Freehostia domain.
3. No DMARC Alignment: Since your SPF is frequently broken and you have no DKIM, your emails fail DMARC alignment. When a message completely fails authentication, Gmail doesn't even bother putting it in the spam folder; it silently deletes it to protect users from phishing.
4. Why Replies "Sometimes" Work: When you reply to an email, Gmail sometimes relaxes its rules slightly because an established conversation thread exists, or the routing header falls into a temporary "authenticated sender" cache.

How to Fix It (The Permanent Solution)

To guarantee festival planning info gets delivered, you need to stop using your ISP's SMTP server and align your records.

Step 1: Switch Thunderbird to Freehostia’s SMTP

Instead of using your ISP to send mail, use Freehostia’s actual outgoing mail servers. This ensures the email originates from the place that actually owns your domain.

1. Open Thunderbird and go to Account Settings.
2. Scroll down to Outgoing Server (SMTP).
3. Edit your outgoing server (or add a new one) and input Freehostia’s official SMTP settings (usually mail.yourdomain.com or a specific Freehostia server string found in your Freehostia Control Panel).
4. Use Port 465 (SSL/TLS) or Port 587 (STARTTLS) and enter your full Freehostia email password.

Step 2: Set Up DKIM in Freehostia

Log into your Freehostia Control Panel and check their Email Manager or DNS Manager.

• Look for an option to Enable DKIM for your domain.
• Freehostia will generate a TXT Record (it will look like a long string of random characters starting with v=DKIM1; p=...).
• If Freehostia manages your DNS, it will apply automatically. If your domain's DNS is managed elsewhere (like Namecheap or GoDaddy), copy that TXT record over to your DNS provider.

Step 3: Fix Your SPF Record

Once you switch to Freehostia's SMTP, you can stop chasing your ISP's IP addresses. Update your domain's SPF TXT record to only include Freehostia.
It should look something like this:

v=spf1 include:freehostia.com ~all

(Note: Check Freehostia's specific documentation to see if they prefer an include string or a specific IP range).

Step 4: Add a DMARC Record

Gmail now essentially requires a DMARC record to prove you take security seriously. Go to your DNS provider and add a new TXT Record:

• Host/Name: _dmarc.yourdomain.com (make sure to include the underscore)
• Value: v=DMARC1; p=none;

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Note:

Setting p=none is a "monitoring" mode. It tells Gmail:

"Hey, I have a DMARC policy, but if something fails, don't block it yet."

This will immediately satisfy Gmail's basic security checks without risking blocking your own legitimate emails while you transition.

Summary Checklist

Once you make these changes, you can use a free tool like Mail-tester.com or MxToolbox. Send a test email from Thunderbird to the address they provide, and it will give you a scorecard showing if your SPF, DKIM, and DMARC are perfectly aligned. Do this before sending out the festival itinerary!