Still looking for answers, mates

Check the email headers and see the ips reputation at senderscore.org

OR just use mailchimp if you are not selling affiliate promotions but if you are an affiliate then use aweber

U can also try getdrip.com, ininbox, madmimi, direct iq, icontact, campaignmonitor

OR go self hosted and use smtp service like sendgrid or mandrill

when you say "same email template, same products line that they sign up for.."

does that mean you reuse the whole email content without changing anything and sent out to your subscribers?... i suggest you not to do that... because some of the mail servers might mark it as spam and will move it to your subscribers junk/spam folder

another thing is that.... how frequent you email to your subscribers?

did you check for 5000++ subscibers.... all of them are active?
not even one single of them doesnt read your email at all?

what about bounce rate under getresponse?

Yeah you need to figure out why it's hitting the spam folder

Test with plain text with no links, test with different name, different from email address, different format, no images, etc but test only one thing at a time to find the cause of spam folder

Inboxing is down to a variety of factors, Vuedoolor has given you some great advice.
Plain text mail will give better inboxing than HTML.

For mailing in bulk it is best to have your own dedicated IP's then you can build your own reputation and get yourself whitelisted etc.
With service like aweber/getresponse they put all users on same IP pool so if one customer spams it can affect others, this is why they have zero tolerance and close accounts at the drop of a hat.

Copy and paste your email into emailspamtest.com also, that could give further insight.

I have personally experienced that no one email service provider is good all the time. Their IP reputation fluctuates from time to time. So chances are that one service provider which used to give you really good open rates once is not the same in the period of an year or so ...

This is one of the biggest reason, I have started using MailGet combined with different SMTP services.

MailGet is an email marketing front-end that connects with any SMTP provider out there like MailGun, SendGrid, SES, Mandrill etc for sending emails.

At the same time you can connect multiple SMTP services within MailGet which can be chosen while sending the email.

I love to experiment and I send my different email campaigns using different smtp providers one by one to see which one gives me the highest inbox deliverability and opens. Having done that and by experimenting alone, I have personally increased by open rates by over 300%.

The biggest advantage with all these SMTP's is that they charge you on the volume basis and not on monthly basis. So, it is better to keep account with 2 or 3 of them and send your emails using each one of them from a single front-end.

Just doing this alone will increase your open rates as you would now have the better understanding of which service provider gives you the best opens for your email type.

There are also small small tactics that you can follow like you can send your first campaign using one service. Than you can send the same email again to just the users who didn't opened your email the first time.

While sending the same email just to non-opens, switch your SMTP service at the same time, this thing alone will increase your deliverability manifold.

Check MailGet at MailGet : Email Marketing Via Amazon SES To Create, Send, Track Email Campaign

SMTP Services that you can signup to:
1. MailGun
2. Amazon SES
3. SendGrid
4. Mandrill
5. SMTP2GO

How I can learn Email Marketing. Anyone can help me about it. Please, I have a lot of interest of it.

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