strange?

So, why does it try more than 1 time for each MX record?

1996-04-16 11:52:55 0u9D3k-0003K0-00 Failed to connect to c.mx.aol.com [198.81.11.36]: Connection refused
1996-04-16 11:52:55 0u9D3k-0003K0-00 Failed to connect to c.mx.aol.com [198.81.11.35]: Connection refused
1996-04-16 11:52:55 0u9D3k-0003K0-00 Failed to connect to d.mx.aol.com [198.81.11.37]: Connection refused
1996-04-16 11:53:31 0u9D3k-0003K0-00 Failed to connect to d.mx.aol.com [198.81.11.17]: Connection refused
1996-04-16 11:53:31 0u9D3k-0003K0-00 Failed to connect to d.mx.aol.com [198.81.11.16]: Connection refused
1996-04-16 11:53:31 0u9D3k-0003K0-00 Failed to connect to d.mx.aol.com [198.81.11.47]: Connection refused
1996-04-16 11:53:31 0u9D3k-0003K0-00 Failed to connect to e.mx.aol.com [198.81.11.18]: Connection refused
1996-04-16 11:53:31 0u9D3k-0003K0-00 Failed to connect to e.mx.aol.com [198.81.11.15]: Connection refused
1996-04-16 11:53:31 0u9D3k-0003K0-00 Failed to connect to e.mx.aol.com [198.81.11.12]: Connection refused
1996-04-16 11:53:52 0u9D3k-0003K0-00 Failed to connect to a.mx.aol.com [198.81.11.11]: Connection refused
1996-04-16 11:53:52 0u9D3k-0003K0-00 Failed to connect to a.mx.aol.com [198.81.11.30]: Connection refused
1996-04-16 11:53:52 0u9D3k-0003K0-00 Failed to connect to a.mx.aol.com [198.81.11.29]: Connection refused
1996-04-16 11:53:52 0u9D3k-0003K0-00 Failed to connect to a.mx.aol.com [198.81.11.28]: Connection refused
1996-04-16 11:54:31 0u9D3k-0003K0-00 Failed to connect to b.mx.aol.com [198.81.11.32]: Connection refused
1996-04-16 11:54:31 0u9D3k-0003K0-00 Failed to connect to b.mx.aol.com [198.81.11.13]: Connection refused
1996-04-16 11:54:31 0u9D3k-0003K0-00 Failed to connect to b.mx.aol.com [198.81.11.33]: Connection refused