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I can receive but can’t send mail

Experiencing issues with receiving but not being able to send emails in Zimbra Mail Server?
Try some suggested possible solutions!

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I can receive but can't send mail

Remember to always make backups and exercise caution when making changes to your server's configuration.

1

Check SMTP Settings

Make sure that the SMTP settings in your Zimbra Mail Server are configured correctly. Verify the hostname, port number, and authentication settings for the outgoing mail server (SMTP). Make sure that the server address and port match the requirements of your email provider.

2

Verify Firewall Settings

Ensure that your server's firewall is not blocking outgoing connections on the SMTP port. Check both the server-side firewall settings and any network firewalls that may be in place.

3

Confirm DNS Settings

Check the Domain Name System (DNS) settings for your server. Ensure that the server's DNS configuration is correct, and that it can resolve domain names and perform MX (Mail Exchange) record lookups successfully.

4

Review Sender Restrictions

Check if there are any restrictions or filters in place that prevent certain senders from sending emails. Review the server's configuration and settings to ensure that it is not blocking outgoing emails from your account or IP address.

5

Check for Blacklisting

Verify if your server's IP address or domain is blacklisted by any spam filtering services. Blacklisting can prevent your emails from being delivered. You can use online tools to check if your IP or domain is listed and take necessary steps to remove it from any blacklists.

6

Examine Log Files

Check the Zimbra Mail Server log files for any error messages or indications of why outgoing emails are failing. The log files can provide valuable information that can help diagnose and troubleshoot the issue.

7

Test with a different email client

Try sending emails using a different email client or application to determine if the issue is specific to your current client. This will help identify whether the problem lies with the server or the client configuration.

Services We Provide

Issues like being able to receive emails but not send them rarely stay limited to just one setting. At first, it looks like a small configuration gap. SMTP settings, authentication, maybe a port issue. But once you start looking closer, it often connects to hosting layers, security policies, and how the mail server is managed overall. A situation like i-can-receive-but-cannot-sent-mail service usually leads teams into deeper checks. Is the server being blocked externally, are credentials handled correctly, is there a restriction at the network level. These questions don’t sit in isolation. In practice, email reliability depends on multiple moving parts working together. Changes in firewall rules, DNS, or even application updates can quietly affect sending capabilities. Many businesses find themselves reviewing adjacent systems without planning to. That’s why decisions around one issue tend to open up broader areas, infrastructure, security, monitoring. Exploring those connections early often avoids repeated disruptions later.

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Mobile Web

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Outsourcing

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Retro Design

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Zimbra Amc

mobile web

Mobile Web

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Outsourcing

retro design

Retro Design

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Zimbra Amc

Arkuz Technologies
Jindal Poly Films Ltd
The White Ribbon Alliance
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Arkuz Technologies
Jindal Poly Films Ltd
The White Ribbon Alliance
Yusen Logistics

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Sometimes the issue shows up suddenly. Outgoing mail stops, no clear reason. Internal teams try a few fixes, then things get escalated. We’ve worked in setups where everything looked fine on the surface. Logs needed deeper reading. In a few cases, the problem wasn’t even inside the mail server. Different teams approach it differently. Some want quick resolution and move on. Others use the moment to clean up older configurations that had been sitting untouched. Not every engagement is long. Some are brief, focused. Others stretch into ongoing support, especially when systems have grown without a clear structure. It varies. The starting point, though, is often a small break in something that used to work.

What they say about us

We are very happy and satisfied with Jingle service. Their account manager is efficient and very knowledgeable. It was able to create a vast fan base within very short period of time. We would highly recommend Jingle Infotech to anyone.

IT Head, WWE TP

Overall, the two reports were very clear and helpful so thank you for the suggestion to do the focus group. We are currently working with our developer to implement some of these suggestions.

Len W,

Frequently Asked Questions (FAQs)

If you're using a legacy mail client like Outlook 2010 or an old Thunderbird build, you’re probably trying to send via Port 25. Almost every ISP in India (Airtel, Jio, ACT) now silently blocks Port 25 to "prevent spam." You can receive mail fine (on Port 110 or 143), but your "Sent" messages just time out. At JIL, we force everyone onto Port 587 with STARTTLS. It’s a ₹0 configuration tweak, but if you don't do it, you’re basically trying to mail a letter through a welded-shut mailbox.

We see this every single day: a user has "My Outgoing Server (SMTP) Requires Authentication" unchecked. You can receive mail because that only requires your password to pull data. But sending mail requires the server to verify you aren't a relay-bot. If you don't "Use same settings as my incoming mail server," the JIL firewall will kick your connection. You’re paying for a professional ₹1,500 ($16) a month service—don't treat it like an open-relay from 1998.

If your settings are perfect and it still won't go, your Public IP is likely on a blocklist. If someone on your local office Wi-Fi has a virus-laden phone, your entire office's IP gets "Sullied." The JIL server sees a "Dirty IP" and refuses to accept your outbound traffic. Check your IP on Spamhaus. If you're red-flagged, it’s a ₹5,000 ($54) cleanup job or a static IP request to your ISP. Receiving mail works because the "filth" is only on your upload side.

Are you trying to send a newsletter to 500 people from a standard Zimbra account? Stop. You’ll hit the Hourly Threshold. Once you hit that limit, the server kills your "Send" permissions for 60 minutes while leaving "Receive" untouched. It’s a protection mechanism. If you need to blast 5,000 emails, you need a Dedicated SMTP Relay (roughly ₹2,300 or $25/mo extra). Don't blame the server for doing its job of stopping "accidental" spam.

If your "Sent" folder shows the mail but the recipient never gets it—and then your next 5 emails fail—you’ve got a Stuck Message. A 25MB PDF can clog the "Outbound Scanner" on a slow connection. The scanner "hangs," the connection dies, and the server marks your session as "Stale." Delete the big mail from your outbox and try a 1KB test message. In 2026, if you aren't using cloud links for anything over 5MB, you're just asking for a ₹0 headache that feels like a ₹10 Lakh ($10,850) disaster.

Where?

Our Address

C-15 3rd Floor, Amar Colony Main Market, Lajpat Nagar - 4,
New Delhi - 110024, India

info@jingleinfotech.com

+91-11-41622043 / 44
+91 9810143160

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If you need assistance with any of our services please do contact us.
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