Emails are fast, secure, and efficient marketing tools for businesses. However, managing bulk email campaigns comes with its set of challenges. Mailing proxies can help you mitigate many of these challenges.

Such proxies can tackle issues of deliverability, IP blacklisting, spam complaints, and sender reputation. They’re one of the simplest, most efficient, and scalable solutions available.

In this article, we’ll show you how they can help you create high-volume email campaigns.

What Are Mailing Proxies? 

In simple terms, a proxy is an alias. It acts as an in-between for your device and the wider internet. When you connect through a proxy server, internet traffic flows through that server instead of directly from your computer. 

Mailing proxies refer to proxy servers optimized for sending emails at scale. By connecting through these proxies before sending batches of emails, users can:

• Hide their actual IP address and remain anonymous.
• Avoid having their IPs blacklisted if emails get flagged as spam.
• Rotate through multiple IP addresses for high-volume campaigns without triggering rate limits.

Key Protocols Supported by Mailing Proxies 

Here are the primary mailing protocols supported by proxies.

SMTP

This is the standard protocol for sending emails. It allows you to send bulk emails and configure for multiple IPs. SMTPs push emails from one computer to another.

Bulk SMTP Servers have advanced techniques to ensure your emails reach inboxes. They maintain a good reputation with major ISPs (Internet Service Providers) using authentication protocols. 

The proxy is configured to allow or deny incoming and outgoing emails based on factors such as the source address, the sender’s server, and even the content of the email.

IMAP (Internet Message Access Protocol)

This protocol securely filters incoming mail across multiple devices. The end user logs into the email server using IMAP, which IMAP allows users to access their emails from different devices.

You can log in via multiple email clients on computers or mobile devices and read the same messages. All changes made in the mailbox will be synced across various devices, and messages will only be removed from the server if the user deletes them.

POP3 (Post Office Protocol)

POP3 is an older protocol initially meant for older computers. Unlike modern protocols, which support two-way email synchronization, POP3 supports one-way email synchronization. 

It allows users to safely download emails from a server to a local machine. This is great if you have limited server storage space. It’s the most commonly used protocol for receiving email over the Internet, and most email servers and their clients support this standard protocol.

Postfix

Postfix is a free and open-source mail transfer agent that routes and delivers electronic mail. When paired with proxies, it offers excellent performance and security enhancements.

Postfix is a popular choice for managing email marketing campaigns. It’s also a good choice for an MTA because it’s been around for a long time, is very reliable, and is exceptionally lightweight.

Why Email Verification is Essential for Effective Mailing

Email verification is when you verify that an email address is valid and belongs to a natural person. Without verification, your emails are likely to go nowhere.

Verification boosts inbox placement and prevents your email from bouncing. Many hard bounces impair your sender’s reputation. 

We’ll put it this way: sending emails costs your company money. There is a cost attached to each email. That is why even a single email bounce can affect your campaign ROI. So, with email verification, you achieve better deliverability.

Anti-Spam Measures: Keeping Your Email Clean

Your email marketing success depends on your sender’s reputation. Mailbox providers determine email sender reputation scores to ensure their customers are happy with their services. 

A clean reputation reduces the chances of your email landing in spam folders.

Using proxies for mailing can help you comply with anti-spam regulations. Marketers segregate email traffic across various IP addresses. 

They use different IP addresses for different types of emails (e.g., marketing vs. transactional) to manage reputations separately. This reduces the risk of being flagged for spam-related activities.

Here are the key protocols used by ISPs (Internet Service Providers) to protect users from cyber threats and email fraud. They improve the legitimacy of delivered emails and reduce the risk of in-transit interference. 

1. DKIM (DomainKeys Identified Mail).
2. SPF (Sender Policy Framework).
3. DMARC (Domain-based Message Authentication, Reporting, and Conformance).

These protocols authenticate email messages so recipients can be confident that the message is legitimate and not spam. 

They also prevent spoofing by ensuring that the message comes from the claimed domain or IP address. 

To send bulk emails without triggering spam filters, you can:

• Use verified email lists, ensuring there’s an actual user on the receiving end of the email.

• Maintain your Sender’s reputation. One way is to make it easier for customers to unsubscribe.

• Avoid using trigger words or keywords that could land your email in the spam folder.

Secure Email Communication: The Role of Different Ports

Different ports come with varying degrees of security measures. Standard Ports remain open for all types of traffic. 

Conversely, Secure Ports has a data transfer tunnel. It uses Secure Socket Layer (SSL) certificates and advanced encryption to protect internet connections and keep sensitive information safe. 

Secure ports are crucial for secure email communication.

Many email providers encrypt messages. This safely transmits them between the sender and recipient’s email servers, so attackers can’t intercept emails while they’re in transit.  It bars them from viewing, altering, or stealing the sensitive information those messages contain.

SMTP Ports

An SMTP port is designed to direct email through a network to its recipient. The most important SMTP ports are Port 25, Port 587, and Port 465. 

Others commonly associated with SMTP include 993 and 995. Each port serves a specific purpose in the email delivery process. 

IMAP and POP3 Ports

Ports 143, 993, 110, and 995 are related to IMAP and POP3 protocols. These enable users to access their email accounts and retrieve messages from mail servers.

Port 143 is the standard unencrypted port for IMAP, while Port 993 is the recommended port with SSL/TLS encryption. Depending on your security needs, you can use one or the other.

Scaling Email Infrastructure for High-Volume Campaigns 

Email marketing comes with challenges like IP blacklisting and server load issues. 

An email blacklist is a list of IP addresses associated with spam. IP blacklisting cuts off your access to entire platforms full of qualified leads. 

Server load issues can also occur when handling a large number of new customers. It hurts to see such costly sites go down.

Here’s how proxy servers for mailing can help mitigate these issues.

IP Rotation & Load Balancing

Using multiple IPs and servers helps distribute email load and avoid blacklisting. Proxies help with IP rotation, which is a way of load balancing. This spreads user requests evenly across servers to improve speeds. 

These IP addresses change constantly or randomly with each connection request to the target website. This way, you can optimize performance and prevent server overload.

Scalability Tips

Along with IP rotations, you can do the following

• Scale your campaign gradually. 
• Monitor its performance using CTR, bounce rates, growth rates, etc. 
• Maintain your email list regularly.
• Use A/B testing for improved performance.
• Create valuable content.

V6Proxies.com: Your Go-To Solution for Mailing Proxies

Why should you choose V6Proxies over other mailing proxy providers out there? V6 Proxies offers highly secure mailing proxies along with:

• Comprehensive Protocol Support (SMTP, POP3, and IMAP) for seamless integration with any email setup.
• One of the largest dedicated mailing IP pools in the industry, it gives access to over 1 million IPv4 and 4 million IPv6 addresses.
• A Global Reach. There are many options for sending emails from different regions using global and country-specific residential IPs.
• Smart Proxy Mixing. It combines residential and data center proxies to balance deliverability and speed.
• Advanced Rotation Capabilities that automate rotation between proxy types for enhanced campaign management.
• Protocol Flexibility, supporting both HTTPS and SOCKS5 and accommodating different security and application needs.
• Custom Authentication Options — Granular user/pass and IP authentication for tailored access.
• Transparent Proxy Attribution. It allows users to verify ISP sources, ensuring reliability and trustworthiness.
• We have automated Proxy Rotation, which maintains deliverability and optimizes performance for large-scale campaigns.

Conclusion 

Proxies for mailing can help you run high-volume email campaigns without triggering spam filters, facing deliverability issues, or risking your IP address. 

For a successful and sustainable email campaign in the long run, we recommend clean, verified, and secure email practices.

With V6Proxies.com, send high-volume emails at scale and meet your marketing goals. We have over 5 million rotating residential and data center IPs optimized for all significant ESPs, coupled with the largest and most reliable pools tailored for high-volume mailing.