Spam Filters
Aggressive ISP filters may block your IPs or domains if you test from a single static server location.
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Email Protection & Testing
Ensure your emails land in the inbox, not the spam folder. Test global deliverability, SMTP performance, and marketing automation flows with diverse residential IPs.
The Deliverability Challenge
Sending emails is easy; getting them read is hard. ISPs filter heavily based on sender reputation, content, and origin.
Regional Blocks
Some email providers block traffic from outside specific countries, making global testing difficult.
Reputation Burn
Testing your own infrastructure heavily can inadvertently damage your sender score.
Content Variation
ISPs may render dynamic content differently based on the user's apparent location.
Optimize with Flamingo
Use our huge pool of residential and ISP proxies to simulate real user behavior for sign-ups, logins, and email interactions.
Inbox Placement
Test if your emails land in Primary, Social, or Promotions tabs from different geos.
Account Creation
Create test accounts on Gmail, Outlook, and Yahoo without getting flagged for bulk registration.
SMTP Testing
Verify your SMTP relay servers' performance and connectivity from external networks.
Link Validation
Crawl links inside your emails to ensure they resolve correctly and aren't flagged as phishing.
Secure Your Reputation
Blacklist Monitoring
Monitor blacklists (RBLs) essentially.
Auth Verification
Verify DKIM, SPF, and DMARC setups globally.
Rendering Tests
Test HTML rendering across different ISPs.
Flow Automation
Automate sign-up flows to test welcome sequences.
Send with Confidence
Don't guess where your emails are going. Test your infrastructure with Flamingo Proxies today.
Expert Insight: Optimizing Deliverability
Email deliverability is a complex metric influenced by sender reputation, content quality, and recipient engagement. Validating that your emails reach the inbox across different regions and ISPs is critical for marketing ROI.
Testing from a single server IP yields limited insights and risks reputation damage. A distributed testing approach, utilizing residential proxies, simulates real user interaction from various global locations. This allows you to identify and rectify regional filtering issues, verify proper rendering on different clients, and ensure your authentication protocols (SPF, DKIM, DMARC) are correctly propagated worldwide. Flamingo Proxies empowers comprehensive email assurance strategies.
Residential Proxies
High-quality residential proxies from real devices for ultimate anonymity.
Flamingo Entry Residentials
from
3.14
€
/GB net
8M+ IPs across global locations
Avg. 400ms average latency
Rotating & sticky sessions
Global geo targeting (country/city)
Balanced performance focused on reliability
Ideal entry-level plan for broad web coverage
Most Popular
Flamingo Standard Residentials
from
5.94
€
/GB net
24M+ Residential IPs
Avg. 350ms average latency
180+ countries
City targeting & sticky sessions
High uptime
Perfect for raffles & sign-ups
Flamingo Ticket Residentials
from
8.39
€
/GB net
100M+ unique IPs across 180+ countries
Avg. 300ms average latency
CUSTOM dedicated pool optimized for high-demand platforms
High uptime
Clean, High-Quality IPs
Rotating or sticky sessions
Flamingo Sneakers
from
8.39
€
/GB net
100M+ unique IPs across 180+ countries
Avg. 250ms average latency
CUSTOM dedicated pool optimized for high-demand targets
High uptime
Best performance for time-sensitive events (unique & reliable)
Rotating or sticky sessions
Most Popular
Flamingo Deluxe Residentials
from
10.14
€
/GB net
100M+ unique IPs across 200+ countries
Avg. 250ms average latency
Private un-shared pools
UNBANNED almost everywhere
High uptime
Best performance for all major sites
Flamingo Enterprise Residentials
from
12.59
€
/GB net
120M+ IPs (largest pool)
Avg. 200ms average latency
High success rates across most sites
Rotating & sticky sessions
Global geo targeting with city targeting
Strong, consistent performance and uptime — built for scale (teams, pipelines, SLAs)
5G/4G LTE Mobile Proxies
Gain access to the most trusted IPs available. Ideal for social media management, ad verification, and high-stakes web scraping.
Unmatched Speed
Leverage blazing-fast 5G & 4G LTE speeds with low latency.
IP Anonymity
Mobile IPs are highly trusted and less likely to be blocked, giving you maximum anonymity.
Global Coverage
Connect through real carrier IPs from 100+ countries for true local context.
ISP Proxies
High-speed ISP proxies with unlimited bandwidth for enterprise tasks.
Email Testing FAQ
Got more questions? Join our Discord for personalized support.
Can I use port 25?
Generally, port 25 is blocked on residential networks to prevent spam. We recommend testing via webmail (HTTP/HTTPS) or using standard submission ports (587, 465) if checking connectivity.
Are these IPs blacklisted?
We rotate IPs frequently. While individual residential IPs may have history, our vast pool allows you to find clean IPs for accurate deliverability testing.
How do I automate email checking?
You can use tools like Selenium or Puppeteer via our proxies to log into webmail interfaces (Gmail, Outlook) and verify that emails have arrived in the Inbox.
