Ever feel like your perfectly crafted cold emails are disappearing into a black hole? You spend hours researching prospects, writing personalized messages, and hitting send—only to get crickets in response. Before you blame your subject lines or call-to-action, check something more fundamental: your GMX SMTP settings.

Here’s a reality check that’ll make you sit up straight: only 23.9% of all sales emails are opened worldwide. That means 76% of your outreach never even gets a chance to work its magic. But here’s the kicker—cold email delivers a $42 return for every $1 spent, making it one of the highest ROI marketing channels available.

For Business Development Representatives and Account Executives, every email that doesn’t reach the inbox is a missed opportunity. Whether you’re prospecting new leads or nurturing existing relationships, your GMX email configuration can make or break your sales pipeline. This guide will walk you through setting up your GMX SMTP, POP, and IMAP settings so your emails actually land where they belong—in your prospect’s inbox.

What Are the GMX SMTP Settings?

Think of SMTP (Simple Mail Transfer Protocol) as your email’s delivery truck. When you hit “send” on that carefully crafted follow-up email, SMTP takes your message from your email application and delivers it across the internet to your prospect’s inbox. Without proper SMTP settings, your emails get stuck in digital limbo.

Here are the essential GMX SMTP settings every sales professional needs:

Port 587 is your best friend for modern email delivery. It uses STARTTLS encryption, which starts with an unencrypted connection and then upgrades to secure. This approach offers excellent compatibility with most email applications while maintaining strong security.

Port 465 is the alternative, using SSL encryption from the start. While it works, Port 587 is generally preferred by email providers and applications for its flexibility.

Avoid Port 25 like the plague. Many internet service providers block this port to prevent spam, which means your cold emails might never reach their destination. For sales professionals, using the wrong port can be the difference between booking a meeting and having your email disappear forever.

Here’s something that’ll blow your mind: sales reps spend 21% of their day writing emails. That’s more than one full workday per week! If those emails aren’t configured properly to reach inboxes, you’re essentially working for free one day every week.

What Are the GMX POP Settings?

POP3 (Post Office Protocol 3) is like having your mail delivered directly to your home mailbox—and then the postal service throws away the original. It downloads your emails to one specific device and typically removes them from the GMX server.

Here are the GMX POP settings:

While POP3 works fine if you only check email from one desktop email program, it’s not ideal for today’s sales professionals. Imagine this scenario: you send a follow-up email from your desktop email program in the office, but when you check your phone during lunch, that sent email isn’t there. Your prospect replies, but you don’t see it until you’re back at your desktop email program. That’s a recipe for missed opportunities and confused prospects.

For BDRs and AEs who need to stay connected across multiple devices—desktop email program, laptop, and mobile—POP3 creates synchronization headaches that can hurt your sales efficiency.

What Are the GMX IMAP Settings?

IMAP (Internet Message Access Protocol) is like having a cloud-based filing cabinet for your gmx mail. Instead of downloading emails to your device, it keeps everything on the GMX server and synchronizes across all your devices. When you read an email on your phone, it shows as read on your desktop email program too.

Here are the GMX IMAP settings:

For sales professionals, IMAP is a game-changer. 81% of all emails are now opened and read on mobile devices, which means your prospects are likely checking your emails on their phones. With IMAP, you can respond immediately from any device without losing context or duplicating efforts.

Whether you’re following up from your desktop email program, checking replies on your phone via the gmx mail app android or ios apple app store, or preparing for a demo on your tablet, everything stays perfectly synchronized. This seamless access can be the difference between responding to a hot lead in minutes versus hours.

How to Configure Your GMX SMTP Settings?

Setting up your gmx email account in your preferred email application is straightforward once you know the steps. The process is similar across most platforms, though the exact interface might vary.

Essential First Step: Enable POP3/IMAP Access

Before diving into your email application, you need to activate external email access in your GMX webmail settings. Log into your GMX account online, navigate to Email → Settings → POP3 & IMAP, then enable “Send and receive emails via external program” and click Save.

Manual Setup Process

Step 1: Open your email application (Outlook, Thunderbird, Apple Mail, or mobile app)

Step 2: Look for “Add Account” or “Account Settings”

Step 3: Choose “Manual setup” when prompted

Step 4: Select IMAP as your account type (recommended for sales professionals)

Step 5: Enter your details:

• Name: How recipients see you
• Email: Your full GMX email address
• Incoming Server: imap.gmx.com (Port 993, SSL/TLS)
• Outgoing Server: mail.gmx.com (Port 587, STARTTLS)

Step 6: Enter your GMX email address as username and your GMX password

Step 7: Ensure “My outgoing server requires authentication” is checked

Step 8: Complete the setup and test with a test email

Quick Setup Tips for Popular Applications

Outlook: Go to File → Add Account → Manual setup. Choose IMAP and input the server details above.

Thunderbird: The application often auto-detects settings after entering your email and password. If not, use manual configuration with the settings provided.

Apple Mail: Mail → Add Account → Other Mail Account, then enter your IMAP/SMTP details.

Mobile Apps: Download the official gmx mail app android from google playstore or gmx mail app from ios apple app store for the simplest setup experience.

“Streamline Your Cold Email Setup”

Stop wasting time on email configuration. Salesso handles all the technical details so you can focus on what matters—booking meetings and closing deals.

Try Salesso

How to Test Your GMX SMTP Configuration?

You wouldn’t walk into a sales presentation without practicing your pitch, right? The same logic applies to your email settings. Testing your GMX SMTP configuration ensures your emails actually reach their destination.

Simple Testing Methods

Self-Test Email: Send a test email from your configured GMX account to another email address you own (Gmail, Outlook, etc.). Check if it arrives in the primary inbox or spam folder.

Online SMTP Testing Tools: Tools like Mailmeteor’s SMTP Tester can verify your configuration by attempting to connect to the GMX SMTP server and providing detailed technical feedback.

Mobile Testing: Send test emails from both your desktop email program and mobile device to ensure synchronization works properly.

Why Testing Matters for Sales Success

Here’s a stat that should make every salesperson pay attention: the average cold email reply rate is just 8.5%. But here’s the thing—that’s assuming your emails actually reach the inbox. If your SMTP settings are wrong, your reply rate drops to zero.

Email bounces are silent pipeline killers. A high bounce rate damages your sender reputation, making future emails more likely to land in spam folders. For cold email campaigns, keeping bounce rates below 3-5% is crucial for maintaining deliverability.

Boost Email Deliverability Today Find emails, warm domains, send campaigns

Get Started

Every bounced email represents a lost opportunity. For BDRs, that’s a potential discovery call that never happens. For AEs, it’s a stalled deal conversation. Proper SMTP testing protects your most valuable asset—the ability to connect with prospects.

More SMTP Settings

Getting your basic GMX SMTP settings right is just the beginning. For sales professionals serious about email success, there are deeper layers that can dramatically improve your results.

Email Authentication: Your Digital Reputation

Think of SPF, DKIM, and DMARC as your email’s credentials. These DNS records tell receiving email servers, “This email is legitimately from this sender.”

SPF (Sender Policy Framework) lists which IP addresses can send email on behalf of your domain. DKIM (DomainKeys Identified Mail) adds a digital signature that proves your email hasn’t been tampered with. DMARC (Domain-based Message Authentication, Reporting, and Conformance) tells servers what to do if authentication fails.

Without proper authentication, your emails look suspicious to spam filters. In 2025, authentication failures are basically a fast track to the spam folder, which kills your cold outreach before it even starts.

List Hygiene: Quality Over Quantity

Sending cold emails to multiple prospective clients from the same email address increases reply rates by 93%, but only if those email addresses are valid. Regularly cleaning your prospect list removes invalid addresses that cause bounces and damage your sender reputation.

Every bounced email doesn’t just fail to reach its target—it actively hurts the deliverability of all your future emails. This creates a downward spiral where your carefully researched prospects never even see your messages.

Content and Sending Best Practices

Your GMX SMTP settings get your emails delivered, but your content determines whether they get opened and replied to. Personalized subject lines generate 50% higher email open rates compared to generic ones.

Keep your emails concise and valuable. Cold email body content with more than four sentences or roughly 150 words tends to receive an average response rate 15 times higher than shorter emails. This might seem counterintuitive, but longer emails that provide genuine value perform better than short, vague messages.

Follow-up religiously. 80% of sales transactions necessitate a minimum of five follow-up emails or other forms of contact. Most salespeople give up after one or two attempts, but persistence pays off when done respectfully.

“Maximize Your Email Performance”

Don’t let technical settings limit your sales potential. Get expert email deliverability with Salesso’s comprehensive platform.

Start Free

One Giant Leap for Your Inbox

Mastering your GMX SMTP settings isn’t just about technical configuration—it’s about building a foundation for sales success. When your emails consistently reach the inbox, you create more opportunities for meaningful conversations with prospects.

The statistics we’ve covered paint a clear picture: email remains one of the highest ROI sales channels available, but only when configured properly. 43% of salespeople say that cold email is the most effective sales channel, making proper setup a competitive advantage.

For BDRs, correct SMTP configuration means more discovery calls booked. For AEs, it means better engagement with qualified opportunities. The time you invest in getting these settings right pays dividends in pipeline generation and deal closure.

Remember, every email that bounces or lands in spam is a missed opportunity. In a world where campaigns with 4-7 email sequences get three times the response rate compared to those with only 1-3 emails, you can’t afford to have technical issues sabotaging your outreach efforts.

Your GMX email account, when properly configured, becomes a powerful sales tool that works 24/7 to connect you with prospects and advance deals. Take the time to set it up right, test it thoroughly, and watch your email engagement soar.

Scale Your Cold Outreach All-in-one platform for email success

Try Now

Frequently Asked Questions