O365 Emails Bouncing: Resolve with Our 365 Hardening and Domain Security Tool

Note: We only support business accounts on Microsoft 365.

Are your business emails bouncing back or going to spam?

If your business is getting a lot of bounce-back emails or emails sent to external recipients going to spam, emails to Yahoo or Gmail not being delivered or customer tell you you sent them suspicious emails?

Need help to setup your email correctly to stop delivery failures

Our Office 365 hardening and domain security service is designed to help small business get back to work quickly

Our tools are perfect for this and will ensure you have the correct settings that emails are delivered.

We will set up your email correctly, without any fuss or hassle ensuring your emails are delivered as they should be. This issue can arise from configuration errors on your domain name, and it can sometimes indicate hacking or blacklisting problems.

We can ensure the smooth delivery of your emails & a major reduction in successful hacking attempts.

This service is designed for Small Businesses with 5-10 staff who need things setup correctly & don’t need Managed IT Services. We only work with Microsoft 365 exchange online.

Web Designers and Your Domain Names:

In our experience many web designers struggle to configure your domain name(s) correctly, so let the experts handle this.

They will still host your website and do all the brilliant design and marketing work & we will look after your domain name(s)

This makes it much harder for an errant web designer to inadvertently stop your emails working (which unfortunately happens a lot more than you would think!)

Email Authentication Protocols: SPF, DKIM, and DMARC

SPF, DKIM, and DMARC are protocols for verifying that emails are actually sent from your domain name.

• SPF (Sender Policy Framework): This is a security measure that verifies outgoing emails from your domain are coming from a list of approved servers. It helps prevent others from sending emails pretending to be from your domain.
• DKIM (DomainKeys Identified Mail): DKIM adds a digital signature to each email you send. This signature helps the receiving email server confirm that the email hasn’t been tampered with and actually comes from your domain.
• DMARC (Domain-based Message Authentication, Reporting & Conformance): DMARC uses SPF and DKIM to provide further protection. It allows you to specify how email receivers should handle emails that don’t pass SPF or DKIM checks, and it also sends reports about email delivery to help you monitor and improve email security.

These authentication methods play a key role in protecting against spam, phishing attacks, and other email cybersecurity threats.

Setting up these protocols for your domain can be a complicated and time-consuming process. It’s important to get it right, as policies that are either too strict or too lenient can stop your emails from being received. We will setup your Microsoft Office 365 email with the right settings quickly!

SMTP SPF, DMARC AND DKIM errors

If you are getting bounce-back email message error messages from the recipients email server like:

550, “5.7.26” 553 or 554

connection dropped due to SocketError'

onmicrosoft.com

authentication-results: dkim=none (message not signed)

domainkeys identified mail

Microsoft SMTP Server

Your message couldn't be delivered. Despite repeated attempts to contact the recipient's email system it didn't respond.

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

For more information and tips to fix this issue see this article: https://go.microsoft.com/fwlink/?LinkId=389361.

You can learn about the non-delivery report error codes here:

https://senders.yahooinc.com/smtp-error-codes/?guccounter=1

Problems emailing to Yahoo.com, yahoo.co.uk sky.com, aol.com, gmail.com googlemail.com etc. Mail servers?

These email providers require your domain to be setup correctly for outbound email to work.

Other things we see:

Domain Spoofing

Fake Emails from similar recipient email addresses:

fakebillgates@microsoft.com is NOT the same recipient email address as fakebillgаtes@microsоft.com this is called domain spoofing and is very hard to spot. You can try retyping the email address.

Expired Domains

Part of our domain management service is to try and make sure this doesn’t happen again!

Blacklisted

Domains or IP addresses can be blacklisted for sending Junk email.

You can check your IP address and Domain name using the mxtoolbox tool

Mailbombing / Email Bomb

You get thousands of signup requests etc – this is to hide that hackers have reset access to one of your accounts or ordered goods in your name. You need to find the genuine emails quickly! try searching for emails not containing “unsubscribe”

Note: We only support business accounts on Microsoft 365.

Optional Extras:

• N.B As part of the hardening we will attempt to clean up old settings which are no longer used.
• Handholding users if they or you need help with using Authenticator or you need other help with the basic security measures.
• Baseline Audit of previous attacks on your email address.
• Licences and billing, Constant monitoring that undo any security change that we have set.
• Office 365 end-user support.
• Cyber Training: We strongly advise all companies to procure monthly training courses for their staff.
• Other services:
• Incident response and remediation – from £1000 per incident.
• Project Management £100 per hour.
• Fully Managed Cyber & IT Support.

Ready to buy?

Click here to arrange our office 365 hardening package

Need More Help?

Or if you have questions – Click here to book a call

Note: We only support business accounts on Microsoft 365.