Achieving high Email Deliverability, maintaining a strong Sender Reputation, and preventing your messages from landing in Spam Folders all begin with the correct configuration of your SMTP account, DNS records, and Sending Limits.
The Gersuz Email Marketing Platform includes several built-in protections and validation tools that help ensure your campaigns reach your subscribers’ inboxes safely and effectively.
1. Mandatory DNS Configuration Check (SPF, DKIM, DMARC)
When a user sets up an SMTP Sending Account, Gersuz automatically analyzes the domain’s DNS records.
If one of the three critical DNS Authentication Records(SPF, DKIM, or DMARC) is missing or incorrectly configured, the system warns the user immediately.
These records directly impact:
Spam rate
Inbox placement rate
Domain reputation
Email authentication accuracy
A Domain Without Proper DNS Records has a much higher chance of having emails flagged as spam or rejected by receiving servers.
A Domain With Correct DNS Records significantly improves inbox placement, email trustworthiness, and overall sender score.
⚠️ Before Sending Any Emails via Gersuz, users must confirm that their DNS records are correctly configured.
💡Below is an example of a proper SPF, DKIM, and DMARC setup (example template – you can customize this in the final page):
SPF: v=spf1 include:your-smtp-provider.com -all DKIM: (Generated DKIM public key provided by your SMTP service)
v=DMARC1; p=none; rua=mailto:
DMARC:
dmarc-reports@yourdomain.com
2. Configuring Sending Limits (Hourly & Daily)
Since the Gersuz Email Marketing Platform is an SMTP Relay–Based System, users must accurately configure the sending limits defined by their SMTP service to ensure stable, reliable, and policy-compliant email delivery. Inside the SMTP Configuration tab, users must define the Sending Limits allowed by their SMTP Service.
Hourly sending limit
Daily or monthly maximum volume
These settings allow Gersuz to throttle outgoing messages and Prevent Over-Sending.
Why is this critical?
If the platform sends more than the server allows:
Gersuz includes a powerful Email Validity Checker that validates email addresses in two separate stages to minimize bounces and maintain sender reputation.
Phase 1 – Validation During Import
When the user imports email addresses (single or bulk):
Domains are checked for validity
Syntax and formatting are verified
Invalid or non-existent domains are detected
These emails are automatically moved into the Invalid Emails group
💡Users can review, edit, and correct these addresses. Once fixed, they are moved to the Valid Emails group.
Phase 2 – Validation During Sending (DSN Hard Bounce Processing)
During the sending process:
Emails that return as Hard Bounce
Or emails reported through the configured DSN callback service
…are automatically identified as invalid.
These addresses are then automatically placed into the Invalid Emails group and removed from future sending cycles.
This prevents repeated failed sending attempts and protects the sender’s SMTP reputation.
Non-ASCII Email Address Handling
Some SMTP providers Do Not Support non-ASCII Characters in Email Addresses and may Reject Emails containing such characters.
When the First Email is Rejected by the SMTP Provider due to non-ASCII characters in the recipient address, Gersuz Deliverability Automatically Stops Sending Subsequent Emails With non-ASCII Recipient addresses through that SMTP service. Instead of attempting to send them, these addresses are classified as Sending Errors and added to the Sending Error tab.
You can review these addresses and their error details in the Analytics section and on the Examine Page of each campaign.
Important: These errors are temporary and do not permanently invalidate the affected email addresses. The addresses remain eligible for use in future sending campaigns, subject to the SMTP provider's character support.
Sending Speed Optimization
Gersuz uses an adaptive sending speed mechanism to maintain a consistent and reliable email delivery process. The sending speed is adjusted based on the rate of delivery failures and returned emails, including Hard Bounces, Soft Bounces, and Other Sending Errors.
As the number of these issues increases, The Sending Speed is Proportionally Reduced. This helps minimize repeated delivery failures and maintain sending reliability.
Maintaining a clean email list and targeting high-quality recipients helps optimize sending speed, resulting in a more efficient campaign delivery process.
💡Key Factors That Influence Inbox Placement (Detailed Expert Explanation)
Even with perfect DNS and validation, inbox placement depends on many factors.
Here is a detailed breakdown of the elements that affect deliverability.
A. Domain Reputation
Mailbox providers (Gmail, Outlook, Yahoo) track:
History of sending from your domain
Complaint rates
Bounce rates
Engagement rates
Past spam activity
⚠️A domain with poor reputation gets filtered more aggressively.
B. IP Reputation (Dedicated or Shared SMTP)
If using a shared SMTP, other users on the same IP affect your deliverability. If using a dedicated IP, warming up the IP is crucial.
C. Engagement Signals (Opens, Clicks, Replies)
Mail providers analyze user engagement:
High open rates = trustworthy sender
Frequent deletes without opening = negative signal
Replies and forwards = very strong positive signals
D. Content Quality and Spam Triggers
Spam filters evaluate:
Excessive promotional wording
Poor text-to-image ratio
Overuse of links
Unsafe domains inside the email
💡You can solve this issue by using the URL Tracking designed in the Gersoz user panel.
Missing or broken unsubscribe link
💡With this feature properly designed in the Gersuz email marketing platform, unsubscribe links are never lost or broken and are properly accessible.
G. Authentication Alignment (SPF, DKIM, DMARC Alignment)
Inbox providers consider alignment between:
From address
DKIM signing domain
SPF envelope domain
DMARC policy
Misalignment increases the chance of spam placement.
💡Final Recommendations
Always configure SPF, DKIM, DMARC before sending
Set correct hourly and monthly sending limits
Use Gersuz’s two-phase email validation
Warm up new domains or dedicated IPs
Follow healthy sending patterns
Avoid purchased lists or low-quality data
Maintain strong content structure and avoid spam trigger phrases
With these configurations and best practices, users maximize their deliverability and maintain a strong long-term sender reputation.
Frequently Asked Questions
Why are my emails going to the spam folder?
Emails usually end up in the spam folder due to missing or incorrect DNS records (SPF, DKIM, DMARC), poor sender reputation, high bounce rates, sending too fast, or using low-quality email lists. Gersuz helps prevent this by checking your DNS records and validating your email list automatically.
How do SPF, DKIM, and DMARC affect email deliverability?
These authentication records verify that your emails are legitimate. 1.SPF confirms your sending server 2.DKIM signs your emails digitally 3.DMARC enforces authentication policies Correct setup greatly increases inbox placement and reduces spam flags.
What happens if my SMTP sending limit is too low?
If your limit is lower than your campaign volume, your SMTP provider may rate-limit, throttle, or suspend your account. Gersuz prevents this by letting you configure hourly and monthly limits based on your SMTP provider’s policies.
How does the Gersuz Email Validity Checker work?
It performs email validation in two phases: 1.During import – checks syntax, domain validity, and formatting. 2.During sending – removes emails that return hard bounces via DSN. This protects your sender reputation and prevents future delivery issues.
Why is domain reputation important for email marketing?
Mailbox providers track your domain’s sending history. High complaints, bounces, or spammy behavior damage your reputation and reduce inbox placement. Using verified DNS records and a clean list helps build a positive reputation.
What is a hard bounce and why should I care?
A hard bounce means the email address is permanently invalid (non-existent domain or mailbox). Repeatedly sending to these addresses harms your domain and IP reputation. Gersuz automatically detects and excludes them from future campaigns.
How can I increase my inbox placement rate?
1.Use correct SPF, DKIM, DMARC. 2.Warm up your domain gradually. 3.Keep your list clean. 4.Send relevant and engaging content. 5.Avoid spam-trigger words. 6.Set correct SMTP limits in Gersuz. Consistency and quality are key.
Does sending too many emails too fast cause spam issues?
Yes. Sudden spikes trigger filters and cause IP reputation damage. Gersuz allows you to set throttling limits so you can send at a safe, optimized pace.
Why does Gersuz warn me about missing DNS records?
Because missing DNS authentication dramatically increases spam risk. The platform checks your domain automatically and shows alerts to help you fix deliverability issues before sending.
Can a bad email list harm my SMTP account?
Absolutely. Sending to invalid or purchased lists leads to high bounce rates and complaints, which can result in blacklisting, account suspension, and poor deliverability. Gersuz's validation system is designed to prevent this.
