You suddenly got blocked by Hotmail/ and you have no clue what happened?

How come your mail is landing in the customers junkfolder? Do you manage your mail reputation? 


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If you need immediate assistance for solving Hotmail or delivery issues (your mail sent to Outlook/Hotmail is blocked):

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For almost every company mail communication is essential to keep the business running.

Deliverability rates of less than 100% have a measurable impact on the business, making it very important to monitor and stay on top of the issue.

Recovering from black listing, Hotmail/ lockout is very tricky. 

This article discusses how companies can stay out of trouble and ensure better mail deliverability including:

  • Understanding Deliverability Issues: The factors that influence e-mail deliverability.
  • Deliverability troubleshooting options.
  • Maintaining your mail reputation





Reputation of a social entity (a person, a social group, an organization) is an opinion about that entity, typically a result of social evaluation on a set of criteria. It is important in business, education, online communities, and many other fields.

Reputation may be considered as: a component of an identity as defined by others.

Reputation is known to be a ubiquitous, spontaneous, and highly efficient mechanism of social control in natural societies. It is a subject of study in social, management and technological sciences.

Its influence ranges from competitive settings, to cooperative ones, like firms, organizations, institutions and communities.


Key words

  • evaluation on a set of criteria
  • defined by others
  • important in many fields
  • component of identity
  • highly efficient mechanism of control


Mail reputation

How to destroy your mail reputation?

Via your mail infrastructure

  • Send your marketing and transactional via your mail server
  • Don’t patch and maintain
  • Forget about security
  • Don’t monitor your corp infrastructure (servers, network, internet,…)


With mass mails

  • Send as much as mail as possible
  • Load your mail with lots of URLs
  • Fill your mail with key words as loans, gambling, commercial proposals, …
  • Use untrusted mail addresses
  • Change your mail address regularly
  • Send it from a server you don’t own
  • Don’t ask, just send
  • Don’t allow to unsubscribe


Players in the game

  • Senders
  • Infrastructure Providers (Send/Receive)
  • Recipients
  • Spam Filters
  • Dark side: spammers, hackers, ..


Consequences & Impact


  • Mail to junk
  • Mail dropped/not delivered
  • Mail returned
  • Mail server blocked
  • Domain & IP black listing
  • Provider black listing



  • You’re the last one to know
  • Very difficult to recover
  • Business down
  • Corporate reputation
  • Internet: forget the right to forget??

Reputation damage = €€€€ !


How to get and keep your mail reputation in shape?

  • Manage your reputation
  • Secure your infrastructure
  • Secure DNS
  • Split transactional and bulk mail
  • Warm up your mail
  • Secure bulk mail partners
  • Become trusted sender



Hotmail /


Download the Guide

Improving E-mail Deliverability into Windows Live Hotmail from


Register for JMRP (Junk Mail Reporting Program)


Register for SNDS (Smart network data services)


Network reputation


Configure SPF (Sender Policy Framework)




SPF tooling


DNS/Domain tooling



Steps and main root causes

See Improving E-mail Deliverability into Windows Live Hotmail

Online info


Useful URLs overview


Blacklists check


Domain Tools Kit


Mail security




Sender ID


SPF configuration