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)
DMARC: v=DMARC1; p=none; rua=mailto:[email protected]
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:
- Spam rate increases sharply
- SMTP account can be suspended
- Server reputation may be damaged
- Campaign performance drops
Correct sending limit configuration ensures:
- Stable delivery
- Compliance with provider policies
- Protection against blacklisting
- Long-term health of the user’s domain reputation
3. Gersuz Email Validity Checker – Two-Phase Verification
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 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.
💡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. - Incorrect HTML structure
Clean, well-formatted content improves inbox placement.
E. List Hygiene & Bounce Control
- Frequent hard bounces
- Sending to purchased lists
- Inactive or old subscribers
- High spam complaint rates
…all reduce deliverability.
💡Gersuz’s two-phase Email Validity Checker solves a large portion of these issues.
F. Sending Behavior & Frequency
- Sudden spikes in sending volume
- Long inactive periods followed by large campaigns
- Sending too frequently to the same subscribers
…can all trigger spam filters.
Consistent sending patterns build trust.
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.
