Mailchimp vs Mailgun

Intuit Faces Securities Fraud Lawsuit

Rosen Law Firm reminds Intuit Inc. investors of the September 8, 2026 deadline to become lead plaintiff in a securities class action lawsuit. The lawsuit alleges that Intuit made misleading statements about its growth prospects and the performance of Mailchimp, its email marketing platform. Specifically, the complaint claims that Intuit concealed competitive pressures from generative AI and that Mailchimp was not achieving the turnaround to double-digit growth as touted. The class period spans February 25, 2025 to June 1, 2026. Investors who purchased Intuit securities during this period may be eligible for compensation. The deadline to move the court to serve as lead plaintiff is September 8, 2026. The lawsuit is ongoing and no class has been certified yet.

• Rosen Law Firm filed a securities fraud class action against Intuit Inc.
• The class period is between February 25, 2025, and June 1, 2026.
• The deadline to apply for lead plaintiff is September 8, 2026.

Fixing 550 SPF Check Failed Error

This technical guide explains the 550 SPF Check Failed error — a rejection by a receiving mail server when a sender's domain fails SPF (Sender Policy Framework) validation as defined by RFC 7208. It lists common causes (missing or malformed SPF TXT records, incomplete sender lists, exceeding the 10-DNS-lookup limit, or strict DMARC policies) and provides a five-step troubleshooting workflow: verify SPF existence and syntax, include all sending sources, check DNS lookup limits, review DMARC policy, and test/monitor after changes. The article includes example SPF records, best practices (start with ~all, combine SPF with DKIM and DMARC, maintain DNS hygiene), and recommends using SPF/DMARC reporting and external checkers to validate changes and monitor deliverability.

• The 550 SPF Check Failed error occurs when a receiving mail server rejects an incoming email because the sender's domain failed SPF validation.
• SPF is defined in RFC 7208 and requires a domain TXT record that starts with 'v=spf1' to list authorized sending mechanisms.
• Common causes of SPF failures include missing SPF records, incorrect SPF syntax, incomplete sending sources, and exceeding the SPF 10 DNS lookup limit.

Black Friday 2026: Retailers Need Email Infrastructure Compliance

As Black Friday 2026 approaches, retailers must ensure their email infrastructure can handle high-volume surges and comply with stricter sender protocols from Gmail, Yahoo, and Microsoft. Key compliance measures include maintaining a spam complaint rate below 0.1%, implementing one-click unsubscribe, and using SPF, DKIM, and DMARC authentication. Infrastructure readiness involves dedicated send capacity, dedicated IP addresses, load-tested send windows, real-time trigger monitoring, and fallback plans. The stakes are high: in 2025, Shopify merchants generated $14.6 billion in sales over BFCM weekend, and Adobe reported Cyber Week online sales of $44.2 billion. Email remains a crucial channel, with 77% of consumers preferring it for promotions. Sinch's Mailgun, which handled 30% more emails during Black Friday 2025 and delivered over 20 billion emails, provides a checklist to help retailers maximize revenue and avoid deliverability failures that can lead to missed sales and customer dissatisfaction.

• Gmail, Yahoo, and Microsoft have increased security protocols for bulk senders ahead of Black Friday 2026.
• Retailers must keep spam complaint rates below 0.1% to avoid email throttling or blocking; crossing 0.3% triggers blocks.
• In 2025, Shopify merchants generated $14.6 billion in sales over BFCM weekend, up 27% year-over-year.

Mailgun Inspect is now native in Salesforce Agentforce Marketing

New product announcement: Mailgun Inspect is now native in Salesforce Agentforce Marketing, enabling preview and testing of emails within the Salesforce ecosystem.

Mailgun Python CLI for Transactional Email

A technical tutorial demonstrates how to build a small Python command-line app that sends transactional email via Mailgun's HTTP API and verifies delivery through Mailgun's Events API. The guide shows required setup (Mailgun account, API key, sandbox domain rules), how to store credentials in environment variables, and provides concrete code samples for sending messages (Messages API with HTTP Basic auth and form-encoded payload) and checking delivery status (filtering the Events API by message-id). The example app logs sent messages to a local JSON file so users can look up message IDs and refresh delivery status. A GitHub repository with the sample code is provided.

• Tutorial builds a Python CLI that sends transactional email via Mailgun's API and checks delivery via Mailgun's Events API.
• Mailgun sandbox domains only deliver to authorized recipients and require adding recipient addresses in the dashboard.
• Mailgun Messages API requires HTTP Basic Auth (username "api" and API key as password) and form-encoded payloads (application/x-www-form-urlencoded).